Contrary to popular belief, whilst under hypnosis you are in complete control at all times. The altered state of consciousness which occurs during hypnosis allows access to the subconscious mind, however you have the power to reject any instruction or visualisation given by the therapist. You can choose to come out of the altered state at any time. The therapist is acting only as a guide to help you relax and enter these altered states of mind. You are participating to the extent that you accept the guidance of the therapist to help you. No matter how relaxed you may be, the hypnotist cannot force you to do anything against your will.