If asked whether hypnosis works reliably for self-esteem issues, I would say "it is one of the best tools available, but...."

The best way is to go with a hypnotherapist. Good one will address all your specific issues (something that cd program can't), and help you in most cases in very few sittings. Finding a good therapist is a bit harder. Testimonials from real person you know are the best way to go. Guarantees also help, though not many give them. Certification doesn't matter as much as the lenght of clinical experience does.

Second best way is to get a quality hypnosis cd or tape. Not many measure up to the standards. For recommendations, try to ask in the forum. I have good experiences with Hypnosis Network products myself.