we do twins and doubles for our charity quilts. The backing has already been sewn with a 1/4" seam all the way around with about 18" left open. We lay the batting on top and cut it carefully to the size of the backing. Carefully roll the 2 sides towards the middle, and when the 2 rolls meet, then roll from the bottom. As you roll, keep smoothing the batting. After you turn it, use a yardstick to get the batting to lay where you want it. we use large tables that allow you to lay the entire quilt out. Extra people really help!!! The batting does lay pretty smoothly. We tie the quilts.