Well, I did some work on the bookcase today (first project for adult ed class). And I found out a couple of things along the way.
1) I had glued together boards for the pieces, but the pieces weren't flat. Rather than taking a chance on sanding to take out the uneven board joins, I decided to plane them even. Problem was that I only have a block plane. So I used it to plane 3' boards. I was successful in evening up the boards. But it wasn't easy pushing that block plane along the boards. I put lots of gouges in the board faces that took a lot of sanding (and a few still remain). Lesson learned (I think), use the right tool (longer bed plane - I think).2) For the first sanding, I tried 100 paper. It was taking forever to smooth out some of the gouges I created with the block plane. So I went down to 60, and found much greater success. So lesson learned here was to not try to skip sanding steps.
Who knows what I'll discover next.