Anyone who wants to…. Only two things will prevent you from being hypnotized: Unwillingness or Fear. When a person’s fears and concerns have been adequately addressed, the ability to enter into a state of hypnosis is like a muscle; the more you train and work on accessing this state, the deeper you will go.
All hypnosis is really self hypnosis. A skilled hypnotist can act as a guide to achieving and maintaining theta state and can supply well crafted suggestions to use in hypnosis but ultimately it’s an internal process and therefore you do it to yourself. All you need is a willingness to relax and to focus on suggestions that correspond to your goals.