If you can't bring yourself to do it,why not just rehome him for free? Unless you really want the meat. I did my own actuall culling just a couple months ago on someones free roos. It's not that hard to put them in the cone and slice their neck. You snap their neck after the slice,they go quick. The twitching stops quicker than letting them flop around after their heads are cut off. The meat also bruises that way too.