hm...Ive already dropped hints of the library's existence in the nightmares of a player with a story aspect of recurring nightmares (he got tricked into a soul gaze with a real nut job necromancer first session. never thought writing nightmares would be this much fun.) So just wandering into the Library doesnt sit too well with me, at least not yet. Once there I am planning on spinning it like the Unseen University Library from discworld with other influences of course. And they wont be allowed in the stacks w/o some form of payment. In this case it will be a story that has only been passed down verbally, so it doesnt exist in the library yet. I am confident the players can figure that one out. They have already been told the story.
Back on topic, two of the players are casters of some skill and one of them is part of the white council, albeit an errand boy for the council. So they know of the nevernever's existence. So they could also probably get there on their own then. Just need to poke them in that direction so they know thats where the Library is.
I really like the flavor of the stuff on the wiki.