Honestly, nothing helps you gain an understanding (if not an appreciation) of the Bluebook better than constant use. That being said, here are some places you can go if you're stuck on a citation issue. (Don't forget that you can always contact a reference librarian, too).
Gives several additional places to find out: more information about the Bluebook, including its history, additional tutorials (in print and online) on how to use the Bluebook, and links to presentations on the Bluebook.
Will help you learn the citation rules of the Bluebook and ALWD. You will also become familiar with the Bluebook and ALWD as reference guides for finding citation rules.
This primer will help you understand and apply the arcane formats used to properly cite legal authorities.
This is the home page for The Bluebook, but to access its content, you must be a paid subscriber (come to the reference desk for a preview of the Bluebook online to see if you'd like to purchase your own subscription). The site also provides an easy route for reporting errors or recommending changes.
Finally, a good trick for figuring out the citation for a truly bizarre source is to see how other law reviews have done it. In HeinOnline, Westlaw, and LexisNexis, you can limit your results to those articles occurring in the four journals that write the Bluebook (the Columbia Law Review, Harvard Law Review, University of Pennsylvania Law Review and the Yale Law Journal) and see how those editors have dealt with your source (if they have dealt with your source, of course).