Look out curves ahead! A few more techniques for sewing them.
https://www.youtube.com/watch?v=SR_ywxilZe0
https://www.youtube.com/watch?v=wkVQMRmOosA
A favorite without pins.
https://www.youtube.com/watch?v=HTOGt4cRdJE
I still have to make the last circle blocks for a butterfly quilt and need to gather my courage. There is also a great tutorial on the boards here for making them with freezer paper them too.
Enjoy!