I would like to clarify one thing. The binding should be full of batting, so cut the sandwiched quilt leaving about 1/8 to 1/4 inch batting left to fill the batting. I usually do 1/4 " that way I can trim it down a little more if necessary as I go. One other thing is at the corners you need to run your needle through from back to front and down again so the thread holds the corner together. I learned this from a quilt show judge who stayed at my home during our local guild quilt show.