I just finished a double wedding ring quilt and it has a LOT of curves!! Just pin each seam, starting in the center, then ends, then in between. One side will be fuller, sew with that side on top so you can smooth as you go and not get any puckers sewn in. I started clipping the curves, but found that it sewed just as well (and saved time) not to clip. Sew slow and you'll do fine!