Well from what I've noticed so far. If you mess up with the Fusible web you just take it off and do it again. Since everything is going to get covered before your through any glue left on it will be covered. If you mess up while stitching around the applique just pull out the seam ripper and carefully tear out the stitches and then knot what is left in the back so it doesn't run. What other kinds of Quilting nightmares are you having?