Just like a carpenter, measure twice, cut once.
I had practiced the stitch we would use before he arrived, but the actual fabric presented a few challenges. I made it work.
TA DA! It's a flag! We won't win any prizes - there were a few bumps in the road that are evident upon close inspection, but we learned a lot and had fun. We actually were quite compatible in our problem solving, which is saying something about both of us, given our temperaments.
I have two more flags to finish off at my leisure. After about four and a half hours we declared we were done and the three of us went out to eat.