The thing about hypnosis is that you can't be focused on the fact that it's occurring, as Mr. SharPhoe capitulated upon. That's why most professionals and or pseudo-professionals use some sort of distraction that utilizes a rhythmatic, undulating motion or produces some calming, disarming white noise.
Personally I find the prospect of being hypnotized, even by a true, licensed and therefore liable professional, to be rather terrifying.
Call it a product of my type A, control-freak personality, but the idea of someone being able to open my head like a menu, say a few suggestive phrases as a jumping point for me and then having me spew out gods know what for gods know how long, then taking my personal exposition and picking it apart to reveal my deeply buried issues, is terrifying. I'd rather find my issues and their solutions on my own, or perhaps go out in a blaze of justified gunfire.
Then there's the issue of the pseudo-professionals, who might be licensed but without morals and enthralled by power. What's to keep them from getting into my head and, over time, introducing post-hypnotic suggestion phrases into my sub-concious?
So, though I might find it frightening, I'm more than happy to support someone else's choice in going to someone they feel they can trust and exposing all of themselves like a storybook. To each its own.