I pulled out some nonfiction books that I wanted to put in their own category. Sports, poetry, pets were some of the new categories I created from nonfiction. I pulled them off the shelves and had parent volunteers place those stickers on the spines.
I left the E books in their own area untouched, but worked with the chapter books first. Once the stickers were on all the books, it was time to move them off the shelves.