I suggest that you view his postings elsewhere on this forum. To begin with, I also suggest that you learn basic self-hypnosis before moving into thngs which are very specific, like the calculator. Being able to summon up such hallucination, I imagine to require a great degree of fluidity and experience with trance-work. I vouch for the Betty Erickson method as good for beginners. A google search reveals this particular method. Also, I suggest that you be persistent with your library and eventually check out a good book which is about hypnosis in general, and they do exist, but often they have many sections which are specific as well.
