Hypnosis has been around for thousands of years. Egyptians used it in their Sleep Temples to cure people of illnesses, phobias and many other concerns they had.
Hypnosis went through a period in history that made it "Mystical" and associated it with "Black Magic" thinking it was "mind control". Science has disproven this notion, which is why hypnotherapists are not licensed.
Hypnotherapists may be thought of as "guides" or individuals who can help you achieve a hyper-suggestible relaxed state, so that your subconscious will readily accept positive suggestions.
No one will ever reveal deep dark secrets, nor do anything under hypnosis that they wouldn't do otherwise, because people in hypnotic states are fully aware.
I personally believe, because the success of hypnosis depends on how strong your desire for success is, guarantees cannot be offered.
To offer a guarantee is to suggest that I control your mind. I am not that talented so I offer no such guarantees. What I can do is assure you that I will take the time needed to make you feel comfortable and relaxed with me, so that our meetings will not only be enjoyable, but promote more successful sessions.