As with all Library-centric stuff, there's unlikely to be any cohesive 'canonical' answer. My general view of the library is as follows:
1. Archivists (true archivists, the eyeless ones that sprout from behind desks) intuitively know the location of any book in the Library and can almost certainly give directions, with the following caveats: They can't help you if you don't know the exact title, author, edition, and reference number, and their directions are unlikely to be the most direct or easiest to follow. A lot of book-finding in the Library relies on intuition, collaboration, and following directions both from staff and other wanderers.
2. Space in the Library is in flux, constantly. What might be a mile today could be a metre tomorrow; very little is set in stone. This is why the archivists' routes are never the shortest — they only provide directions that are guaranteed to hold for the foreseeable future, ignoring shortcuts and particularly ambulatory corridors. While there's undoubtedly ways to teleport, I think it's probably unwise to try it in the Library, since the notions of 'direction' are hazy at best. Besides, the Library likes knowledge, insofar as it 'likes' anything. I reckon a knowledge-hungry wanderer is probably going to end up finding something useful or important (even if it wasn't what they were looking for in the first place).
3. There's not a huge amount of writing codifying the Library's structure and rules, and very few that I can think of off the top of my head. Teleporters are briefly referred to here, and you can read about archivists here but that's pretty much it. I'd recommend using the tag system to search for relevant pages, but wikidot just deleted literally all tags from every page, so for the moment you might be out of luck >_<
