yikes! i always use 1 1/2" and sew 1/4' seam in front, then pull it to the back and hand-stitch it down. (i usually sew it on the front all the way around the quilt, then use my ruler and rotary cutter to cut all excess batting and backing off, then pull it to the back, fold it down, baste it all the way around the quilt, then handstitch it, and remove the basting stitches once i finish sewing it down.)