The suggestion offers a slightly more efficient way of handling the drawing of the diagonal lines.
Take a piece of fine sandpaper, tape it to your desk. Use this as your work surface to draw the diagonal line. It stays in position nicely and helps the pencil marks adhere... I did like the technique.
Then I was nicely working away at my diagonal lines and down to the last dozen to mark, and it dawned on me to put two of my squares on the sandpaper at the same time. It was slightly more efficient and I wish I had thought of it earlier...
The good news is, Tuesday has come and gone, and all the hour glass blocks are done. This week, when I have 10 minutes at a time, I will trim these up to 4.5". Next Tuesday, I should be able to sew up the 28 blocks.