People keep telling me not to worry too much about making a mistake on a rivet. You can just drill it out and fix it.

OK, when I made my first mistake I found out it actually was as easy as they said.

But my actual mistake was putting the hole in the wrong place. It's hard to repair a hole. I had to order a new doubler and start over. Fortunately Zenith is kind and it was less than $10 and a week, so I learned an easy lesson.