There was a time when I did a lot of them with the envelope method for charity quilts. If you layer the batting on the bottom, the backing next with right side up, then the top on top, with right sides together. You don't need to square-up the backing, just center the quilt top, and pin in place around the outside edges. Sew 1/2" seam all the way around, leaving about 10" open for turning. With the batting sewn in, you don't have to worry about the batting shifting. Clip the corners and turn right side out. If you wanted to reduce the bulk in the seam, you could "grade the seam allowance." Close the opening by hand or by machine. Top-stitch about 5/8" all the way around the outside edge before you tie or quilt. Top-stitching this far away gives the quilt a softer edge.