9. Attach the crown molding at the top (front and sides), the trim pieces at the bottom (front and sides), and the three shelf trim boards (front). Use wood glue, finish nails, and a nail set (to counter-sink the nails). The job is much easier with a electric nail gun, but it can be done without one. Make sure you hammer nails into the top and bottom edge of the trim boards that cover the base of your bookshelf, to secure the bookshelf to the table base.
Tip: It’s hard to hold the boards in place by yourself and hammer the nails, so find a helper for this step. I had to yank out a nail or two and start over.
10. Use wood filler to fill all the nail holes, and use caulk to fill in gaps at the corners and edges of the molding. I find wood filler much easier to work with because I can always sand out mistakes when it dries. Caulk? Not so much.