I use dishes or glass bowls to make the circles on the wrong side of the circle fabric. I sew right sides together of "circle fabric" to very thin interfacing. Trim with pinking shears close to outside of stitched line. Lift up interfaceing into a tent in the middle of the circle and cut a turning hole. Turn circle right side out and press. Easy turned circle. You can also use fusible web just finger press the edge of the circle before you iron it to the base fabric.