I do it like Nanac but I just use watercolor paper for my template. It is like card stock. I also give them a shot of spray starch after ironing and removing my template then give them another pressing. The technique worked great for me. Made this entire quilt using this method and working on a 2nd one. In the linked quilt all of my circles are 5" but you can do any size circle. The key is to make sure you cut out your template accurately.
https://www.quiltingboard.com/pictures-f5/showcase-asian-fabrics-made-quilted-feline-fanatic-t207883.html