Marcy J and Grann of 6-
Honestly the corners frustrate me both ways, front to back or back to front. What Grann of 6 said is how I do it too. I fold the corner and stitch into the inside corner and then pivot and keep stitching down the next side. That leaves the diagonal part of the corner open and I go back and hand tack that portion. Is that clear as mud? :-)