This evening I frogged three days knitting effort - about ten hours worth.
Since I'm ready to forget my blunder, I won't bore us with a long story.
The short story: I knit a sleeve cap on She Said using picked up stitches and short rows. The thing I thought I was going to have trouble with - the cable pattern - looked great. The sleeve was too big around. Bad math. I frogged it.
I'll start the sleeve over tomorrow. Now that I have a better feel for what I'm doing it should go faster.