If you are working with a Hypnotherapist that claims to be able to cure major illnesses, look for one who understands that these techniques are complimentary, and will be able to assist you in realistic goals. The success of this form of treatment is also based on the experience and expertise of the practitioner and the ability to sit still and focus on the part of the patient. A person can practice these techniques at home. The greater the commitment to learning them the better the results are likely to be. Having a qualified practitioner is also essential.
Some states limit the practice of hypnosis or hypnotherapy to licensed therapists only.
Others allow it to be practiced by lay Hypnotherapist but limit the scope of problems that can be addressed. There are many organizations for Hypnotherapists. The Academy for Guided Imagery only provides training for currently licensed professionals. Anyone who promises a cure of a serious illness should be immediately suspect. Ask the questions that are important to you.