While amnesia may occur in very rare cases, people generally remember everything that transpired while they were hypnotized. However, hypnosis can have a significant effect on memory. Posthypnotic amnesia can lead an individual to forget certain things that occurred before or during hypnosis. However, this effect is generally limited and temporary.
Franz Mesmer (1734–1815) believed that there is a magnetic force or "fluid" called "animal magnetism" within the universe that influences the health of the human body. He experimented with magnets to impact this field in order to produce healing. By around 1774, he had concluded that the same effect could be created by passing the hands in front of the subject's body, later referred to as making "Mesmeric passes". The word "mesmerize", formed from the last name of Franz Mesmer, was intentionally used to separate practitioners of mesmerism from the various "fluid" and "magnetic" theories included within the label "magnetism".
You get a no-questions-asked 60 day money-back guarantee. Although I don’t think you will need to call on it (provided you take my advice and work hard to apply the lessons you learn during the course) it is reassuring to know that if you really don’t think the Power of Conversational hypnosis is right for you, then you can get your money back easily.
In as much as patients can throw themselves into the nervous sleep, and manifest all the usual phenomena of Mesmerism, through their own unaided efforts, as I have so repeatedly proved by causing them to maintain a steady fixed gaze at any point, concentrating their whole mental energies on the idea of the object looked at; or that the same may arise by the patient looking at the point of his own finger, or as the Magi of Persia and Yogi of India have practised for the last 2,400 years, for religious purposes, throwing themselves into their ecstatic trances by each maintaining a steady fixed gaze at the tip of his own nose; it is obvious that there is no need for an exoteric influence to produce the phenomena of Mesmerism. [...] The great object in all these processes is to induce a habit of abstraction or concentration of attention, in which the subject is entirely absorbed with one idea, or train of ideas, whilst he is unconscious of, or indifferently conscious to, every other object, purpose, or action.[52]

NLP practitioners claim eye movement can be a reliable indicator for lie detection. In 2012, researchers tested this claim in a series of three studies. In the first study, the eye movements of participants who were telling the truth or lying did not match proposed NLP patterns. In the second study, one group was told about the NLP eye movement hypothesis while the control group was not. However, there was no significant difference between both groups after a lie detection test. In the third study, the eye movements of each group were coded at public press conferences. Again, there was no significant difference in eye movement between them.
Dr. Richard Bandler's work and training has helped millions of people around the world to live a more fulfilled life, where people learn how to think, how to communicate, to become happier more confident and so much more. NLP Life Training is the largests NLP training organistation in the world and we have trained over 25.000 students in the last 10 years.
There is nothing really wrong with the book, per say. I quickly skimmed it and the material seems to be quality and the author seems to have knowledge & expertise with the subject matter. The reason I rated it 'just ok" is that the book is written in a very academic style, like for a research paper or thesis. It seems great for a person studying this topic for a masters or doctoral program, or for a person whom is a practicing therapist. However, I feel it is really not written for a layperson whom is looking to use some of these techniques in the business worlds, say in sales or marketing.
In this state, you are also highly suggestible. That is, when the hypnotist tells you do something, you'll probably embrace the idea completely. This is what makes stage hypnotist shows so entertaining. Normally reserved, sensible adults are suddenly walking around the stage clucking like chickens or singing at the top of their lungs. Fear of embarrassment seems to fly out the window. The subject's sense of safety and morality remain entrenched throughout the experience, however. A hypnotist can't get you to do anything you don't want to do.

If we consider that the conscious is the part of our mind that make the decisions that enable us to function on a day to day basis then the unconscious is the part that stores the information which informs that decision making. We are aware of our conscious mind and actively control it. However we are often not aware of our unconscious and can do little to control it under normal conditions. For example we flinch when someone raises their arm quickly because we unconsciously understand that we may be about to be hit. Flinching is a subconscious decision and we are not consciously aware of making it.

Some notably successful natural language processing systems developed in the 1960s were SHRDLU, a natural language system working in restricted "blocks worlds" with restricted vocabularies, and ELIZA, a simulation of a Rogerian psychotherapist, written by Joseph Weizenbaum between 1964 and 1966. Using almost no information about human thought or emotion, ELIZA sometimes provided a startlingly human-like interaction. When the "patient" exceeded the very small knowledge base, ELIZA might provide a generic response, for example, responding to "My head hurts" with "Why do you say your head hurts?".
Therefore if, as a conversational hypnotist, we can get the subject to demonstrate an unconscious response we can be pretty sure we are communicating with them subconsciously. Emotional responses are dictated by our unconscious and, just like flinching, are an involuntary response to stimuli. You need to exercise caution here. If someone is already upset then they are likely to exhibit emotional responses anyway. In such circumstances other or different emotional responses should be sought. However, assuming the subject is emotionally unbiased, and you notice an emotional response to your language patterns this is a great sign that the subject is in 'open trance.'
The American Society of Clinical Hypnosis is the largest U.S. organization for health and mental health care professionals using clinical hypnosis. Founded by Milton H. Erickson, MD in 1957, ASCH promotes greater acceptance of hypnosis as a clinical tool with broad applications. Today, ASCH offers professional hypnosis training workshops, certification, and networking opportunities that can enhance both professional and personal lives.  ASCH is unique among organizations for professionals using hypnosis. Members must be licensed healthcare workers and, at a minimum, have obtained a master’s degree.
During hypnosis, a person is said to have heightened focus and concentration. The person can concentrate intensely on a specific thought or memory, while blocking out sources of distraction.[7] Hypnotised subjects are said to show an increased response to suggestions.[8] Hypnosis is usually induced by a procedure known as a hypnotic induction involving a series of preliminary instructions and suggestion. The use of hypnotism for therapeutic purposes is referred to as "hypnotherapy", while its use as a form of entertainment for an audience is known as "stage hypnosis". Stage hypnosis is often performed by mentalists practicing the art form of mentalism.