Castor - Understand I am not an admin, so this is just my opinion...
Finding one's way around the library should be a lore. No. A series of lores almost

. The library IS huge, and they don't have the standardization or resources to do the sort of cataloguing and categorization we have in our modern libraries. Most people play the library simply sectionally - 'I was wlaking down the magic section, looking at a group of books on gnoses' type thing. This is probably accurate, but it points out how the library is incomplete: there are any books that, after all, concern more than one subject. I, for instance, beleive that the poetry section, buried somewhere in it, probably has several books of extraordinary interest to a magician. As would mathematics. The section on history would have certain books that are also poetry. Etcetera.
The librarians are key, and should be consulted on any complex or obscure query. And being a librarian should be a real, palpable skill, something one trains for and gains expertise in. The library should always be surprising - you ay be looking for one thing and come across a book that answers a question you had twenty years earlier, and never knew existed.
YMMV - this is just my opinion.