Ben Spackman just created a useful new page, LDS Temple Preparation FAQ, aimed at helping those who are planning on going to the Temple. The page answers many common questions and offers helpful advice. Kudos, Brother Spackman!
I think the more a person knows about what to expect, the better he or she will benefit from their first temple experience. Some people don’t realize that they will be entering a different world with foreign, ancient paradigms. For those who have been there and seek to better understand the incredibly richness of the experience, it can help to learn about ancient covenant forms and the ancient temple concept in general. With such information, I think it becomes clear that Joseph Smith could not have fabricated the temple experience by turning to Masonry or other things in his environment.