When I make a selfbow, once I get it pulled to 20 inches on the tree, I start shooting it. I only draw it to the 20 inches or 22 or 24, etc as I tiller it. Also once it's pulled to 20 inches on the tree, I don't put it back on the tree again. I just shoot it at 20, then 22, then 24 on up to my 28 inch draw. I let the bow tell me which limb if any needs work. Once it's to my 28 draw length I'll put a couple hundered arrows through it. If the tiller is still good, I do the final sanding then shoot it again and stain and seal it.