I just press the binding - first away from the quilt, then folding the edge and steaming a crease in the binding.
I don't use any pins or clips while I'm sewing the back to the quilt.
The steamed fold doesn't require a lot of pinching with my aching hands and there's nothing there to catch on my sewing thread. When I get to a corner, I fuss with it a little bit to make sure that the miter falls in opposite directions, front and back and I sew up one side of that fold and down the other to close it up before moving on to the next edge.