I wouldn't mess with them. Sometimes, butting heads, they'll knock a scur off, and it will bleed a little, but they don't seem to care. You can nip them for cosmetic reasons if you're showing and they're not too big, but if you get too close, they'll bleed just like a dog's toenail. And if you cut them all the way off, it will hurt like fire, and there's a good chance your goat will have a hole in his head where the skull covering his sinus would be if he'd been more thoroughly disbudded. The hole will heal, but it takes a long time and is easily infected.