No such thing as a stupid question!
As for QTing, personally I don't really do any specific quarantine procedure. I do, however, make sure that I watch the tarantula very closely in the first few weeks that I have it, and look for things like mites and such. Aside from that, nothing special - I get them, rehouse if I need to, and set them up in the "Tarantula Corner" with all my other T's.
Aside from mites, there isn't really much that can get passed on, and even in the event of mites, usually they're easy to catch before they infest a whole collection.