I enlarged a finished quilt and it wasn't that difficult. It was long enough, just needed more width. I made a strip for each side, sandwiched and quilted the size necessary. I didn't piece the addition, because the fabric lent itself to my using a strip the width and length needed. I didn't remove the binding, but sewed the strips by stitching on the binding seam. It makes a little added interest to have that line of binding. I am very pleased with the result and it was easier than I thought it would be. Hope I have explained this well enough. (Is it clear as mud?)