I raised chickens and cows. I didn't slaughter my cow personally. It was really hard on me to send him to the slaughter house. I've not done it sense. I made the mistake of making a pet out of him.
I have, however, raised and 'processed' my own chickens. I looked at several ways to kill them without having them go through a lot of stress. One thing I can tell you is to have a super sharp knife ready and don't hesitate cutting the head off. I hesitated the first time and it took me a couple of swipes to kill him. (I didn't do well with that) Do it with strength and quickness and it's over and done with. I had my husband tie their feet together while I held them (feeling horrible for cooing to them when I'm getting ready to kill them) and hung them by the feet over a nail a little higher than my head. Then cut their heads off and quickly turned/walk away. It's not for the faint of heart. Warn you they flop around against the post for a few.
I never did the hot bath dip with them. I just plucked them while they hung on the nail. I always heard this was really hard without dunking them in hot water but I didn't find it difficult at all. I did skin a few and that was really easy and quick if you are planning on stewing them and don't care about loosing the skin.
I can tell you not to wait too long to cull them. My first few were about 6 months old and they were so tough I had to put them in the pressure cooker.
What breed are you planning to get?
I learned a valuable lesson with the first steer I sent to slaughter. I should have named him Hamburger and not Snookers.