So after trimming make the double folds on the corners and sides, press, pin and sew. Sounds easy. The instructions pointed out one aspect I hadn’t considered which was item three on the second diagram. I’d been practice cornering to the outer edge rather than giving it a bit to stitch into (go figure). Thanks Patrice, this was exactly what I needed to reinforce the idea.
Do a lot of quilter’s use this technique? It seems the easiest and most practical method to produce an outer binding. I like it because it hints at the backing fabric, though I do suppose a pieced edge would be pretty as well.