For my books, not library books, I started the Great Re-Read last year. I intend to read them all and decide whether to keep or donate them. It will take years, since I only read them when I'm done with my library books. But by the time I'm ready to retire I'll know how many to pack and move.

I really don't have that many, about 75-80 total. On one hand, packing books is hard because those boxes get heavy so quickly. But on the other hand, when I get to the point it's hard to get out and about, I'll at least have plenty of books to keep me occupied.