Essentially all hypnosis is self-hypnosis. A hypnotist is only a guide for the process. It helps to have someone guide you so you don't have to focus on the process, and your conscious mind can essentially just "let go."
But MrSelfDestruct is right. You won't do anything you wouldn't normalyl do, and if you can always "wake yourself up" and bring yourself out of hypnosis at anytime.
As far as physiological changes as a result of hypnosis, the way I see it, something like that happenning is really no different than "contracting" a psychosomatic illness; i.e.: it appears in your body, but it's really all in your mind. (I hope that last bit made sense.)
Also, a live guide is much more useful than a recorded one. There are a number of physical signals you get from a hypnotic subject (breathing changes, muscular responses, etc.) that should cause a good hypnotist to adjust the process. Obviously, with a recording, it keeps on going regardless of the reactions of the subject.
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"We must have waffles. We must all have waffles, forthwith. Oh, we must think.
We must all have waffles and think, each and every one of us to the very best of his ability."
-- Professor Goldthwait Higginson Dorr, Ph.D.
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