Hi texas, no they wont wear down however they dont grow that fast, Just pretend that you are clipping your boys fingernails. Get some dog nail clippers, the ones with the hole, not the side cutters. and just take the very end off to get a feel for it. see thats not so hard! then take a little bit more off, and then a little more, just do it gradually and you will be fine. If you see blood, just stop. I do my 16 year old hen's spurs this way. One time I got a tiny bit of blood but it stopped quickly and so did I! I dont have any roos at present but theres lots of nice people here who can give you their methods!!