I do a similar thing but skip the freezer paper step. I draw the circle on the interfacing (or dryer sheets) and then use a window or other light source to position the paper over the object. Stitch around, trim with pinking sheers, slit and turn. Depending on the circles (size, quantity, placement), I will sometimes use the fusible interfacing so I can iron them in place before stitching. CAUTION - make sure you have placed your interfacing the correct way so that when you turn it, the fuse side is outside. Anyone using this technique has messed it up at least once!