I'm beginning glue-up of some bookshelves prior to finishing. I am
concerned that I will get wood glue on portions of the wood that should
show, and that they will therefore not take stain.

What precautions can I take against having this happen? What can I do
when it does happen? Obviously, I'll be ready with a rag to wipe off
any glue that does drip onto my surfaces, what else can be done? If I
don't notice a drip right away, is there anything to be done besides
sanding it off? And does that even work, or will the glue have seeped
into the wood too far? (By the way, I'm using red oak here.)

Thanks,

Scott