According to G. Fred Asbell, as written in Traditional Bowhunter Magazine, it is helpful to begin with the string hooked between the 1st and 2nd joints of the fingers (the order would be: finger tip/pad, 1st joint, 2nd joint, etc, towards the main part of the hand), as though you were picking up a paint can, and let the string roll towards the tips as you draw, helping to ensure the arrow stays on the bow. It sounds more complicated than it is, and Asbell explains it better than I can. It's a recent issue of the magazine, I'll see if I can find it...