The joy of speaking to new friends wherever I go, is that I get to hear either their tales of positive experiences with Hypnosis (usually "I have a friend who had Hypnotherapy and it was great for them!) or they share with me their fears of Hypnosis.
So here I go, in the quickest shortest way possible: All hypnosis is self hypnosis.
YOU as the client are always in control, and can come up out of hypnosis at any time if you are uncomfortable, scared or not ok with what you're seeing, feeling or hearing.
You will never do anything that goes beyond your own personal moral code, and no, as much as it would be kinda cool to have like an X-Men ability... I can't control you at all! I can only urge you to move towards your own emotional and physical freedom.
So there we go.