When I come to the corner, I pay attention to how the first part of the binding is folded. On this binding, the outer fold is from the bottom side, so I want the outer fold on the front of the quilt to be from the right side.
[ATTACH=CONFIG]615557[/ATTACH]
I fold the bottom binding up first, then try to make sure the edge that's folded up goes straight to the right. Then I lay my seam ripper or stiletto against the quilt and fold the right side over against the seam ripper. I can usually get a pretty join with a nice 45* angle by doing this. I hold the corner and sew slowly until I get to the place where I need to pivot. I stop with the needle down, lift the pressed foot, and turn the quilt 90*.
[ATTACH=CONFIG]615558[/ATTACH]
[ATTACH=CONFIG]615559[/ATTACH]
[ATTACH=CONFIG]615560[/ATTACH]
This pic is from the side so you can see where I stopped to pivot.
[ATTACH=CONFIG]615561[/ATTACH]
Here is one showing where I'm ready to start sewing again.
[ATTACH=CONFIG]615562[/ATTACH]
In this shot I've made it all the way around the quilt and am almost back to the starting point.
[ATTACH=CONFIG]615563[/ATTACH]