I've learned in my very short time in the chicken realm that everyone cares about their birds. Even when we slaughter them, everyone respects and wants the quickest, least painful way to go. Even when it's not perfect, our intentions are to make it so. We all have to learn somewhere, and things won't always go as planned. I hope you don't feel judged by anyone. I personally have a cone setup for slaughtering my chickens, and a very sharp knife to cut the blood vessels in their necks with. I've read that cutting into the grain of wood (as some others mentioned) when cutting the heads clean off worked well. Good luck in the future