Hypnosis is not something to be feared or seen just as entertainment. Psychologists know that hypnosis can access parts of your sub-conscious that you may not even know about.
We are basically slaves to our beliefs if we are living 'semi-consciously' and not living by choice or inspiration.
Self improvement is more about self discovery or more accurately the discovery of your 'true' self.
Gayle Glassner Twersky has created a set of cds designed to reprogram your subconscious by hypnosis. Click below for a review: