Many people have heard the myth debunked that you have to be especially gullible in order to be able to by hypnotized. The truth of the matter is that you need to simply be receptive to the idea. Hypnosis is a willing state- a place of heightened awareness. In order to be receptive to this state, you must be able to be comfortable and relaxed. You should be willing to trust both yourself and your therapist. And you should be willing to stop trying to consciously control your thoughts and feelings.
Do you remember pretending to be asleep when you were a child – possibly because a parent had come to check on you – and then fallen asleep as a result of pretending? For those who are nervous about being hypnotized, this is key – simply keep relaxing the body, calming the mind, and focusing as you're directed. Before you know it, you'll realize that the state of awareness known as hypnosis is a very comfortable one – you may have even felt like that before!
This is a wonderful article from Roc Hypnosis