Almost everyone can be hypnotized to some level. However, how far and how much benefit is gained varies from person to person. To some extent, hypnosis is a learned skill. The more you are hypnotized, the deeper you can learn to go. Very good hypnotic subjects are sometimes able to have surgery or dental work without anesthesia.
Many women can learn to experience pain-free childbirth without medications.
Simple tests will help determine how good a subject you are likely to be. This is because hypnotized people are very suggestible and may provide false information without intending to. Hypnosis cannot make you do anything you are not ready to do. You must be committed to a goal for it to work for you. Unfortunately, anyone can claim that he or she is a hypnotist and advertise services.