my neighbor does mine (he runs a small engine machine shop) & gets them sharp enough to finish at least 2 animals, usually a 3rd before switching sets. I've had Premier & Oster sharpen them before & couldn't get through half an animal before they were dragging. Look around your town for barber shops & ask where they send their blades.
I ended up sending mine to Steve Carmichael in KY...hope to try them out next week on a couple of unsuspecting "victims"! Hopefully they work better than the ones sharpened by Premier!