I'm not a fan of dehorning in any form, but if you are going to do it, disbudding with a hot iron is the easiest way to go, for both you and the goat. It sounds awful, but it is quick and they forget it fast. Banding is a slow process, doesn't work right if you don't get the bands in the right place (which can be hard to do on a scared goat slinging its head around!), and it seems to give them a bad headache for days, if not weeks. I've never done the paste, but heard horror stories. If we take horns off a kid, we disbud, we do it as fast as we can get it done safely, and give them a baby aspirin and warm milk when it is over. They'll sleep it off and be fine within a day.