Step 15: Wood putty and Sanding
Make sure all the trim nails are counter sunk. Go back over them all with stainable wood putty, allow it to dry then sand it down. Sand the whole bookcase, if its really rough start with a course sandpaper like 60 grit and work up to 220 so its nice and smooth, no splinters etc. Remove all the dust and then go over it again with tack cloth just to be sure.