Almost all books of this type("crossdressing", "introduction to SM", "playing with diapers") are not very informative for asking price, offering the bare-bones of knowledge and reference. Most of "advices" just common sense, like don't be hasty, do everything slowly, clean yourself well, use only special toys etc. Such books are suitable for very beginners, to others who knows at least the base, its useless and look like an overpriced sex toy magazine.