I used a bowl, cut the circle out of paper, folded it in fourths and used that as the template. I did not add an extra 1/4", I did pin the centers to the background. There is a bit of trimming as the fit is never perfect. It wasn't as difficult as I originally thought it might be.
If you stack the squares up, you can cut multiples with a rotary cutter.
Good luck!
C

