Is it real or all in the mind?

So I have been fascinated with the mind for many years now studying it further and the more I read the more I like, because it is interesting and the power it holds.

Or does it? It is accepted that we already have the tools we need to do something or change something so is the hypnotist doing something magical or voodoo style or are you already convinced the change is there before you have changed so you convince yourself you have changed?!?

So, some people say you cannot be hypnotised to do anything against your will but others claim otherwise.

If you met Derren Brown, Paul Mckenna or Jonathan Royle all quality hypnotists would you just believe what they said or would you question it?