I fold and press my binding, and stitch it on with a walking foot. I always machine baste the first 4 or 5 inches so I can do a "trial" fold to the back to make sure the binding JUST covers the stitching line. Then, it's just stitching the rest down. I do put a little tension on the binding when I'm sewing it. I never pin...even the corners! Never had a problem with puckers or pleats!