Ditto Rack-attack' s advice. Especially the part about having the knots facing opposite directions. I like the top loop facing the sight window and the bottom loop facing outboard. That keeps the loop from twisting on the draw and, I feel, makes for a smoother release.

I also wax the snot out of the loop to keep it stiff. That holds the loop open and makes it easier and quicker to get hooked up. And it cuts down on wear and makes the loop last longer.

If I ever go back to using a release, I won' t shoot without a loop.