I agree with Traxx.
I'm no expert, in fact just finished my first bow recently, but I'm just putting a raised spot, or extra wrap in the hemp string wrap in my handle to give me a reference so my hand will be in the same spot every shot, and thereby my hand will work as a consistent shelf without the added technology and hassle of a shelf. Just a trim with a razor blaze and dot of glue on the feathers (where the feather meets your hand) and you don't even notice the arrow passing across your hand. You can order arrows from raptor archery that are already for shooting without a shelf.
-nick