I've raised chickens for many years, and we had them when I was a kid. My parents did the butchering, I helped pluck, back then.
It took me many years to get to the point of being able to do the slaughtering myself. We had a bunch of roos that had to be done, and my husband was having health problems, but still working. I couldn't bear to place one more burden on him. I made myself do it while he was working, because I wanted him to rest on his days off, and not stress about anything on the farm.
It was very difficult, but I learned to sort of mentally detach from the deed, and focus on the mechanics of getting it done as quickly as possibly. Now, it's a lot easier for me, but even when it's a meat cross such as the broiler hybrids, that I really want gone because they eat so much and are so messy, and I get really tired of cleaning up after them, I can't help but feel sadness over ending a life. I thank them for their sacrifice, and the gift of sustenance, and wish them a swift crossing into whatever comes next.
You've had the experience, and even if you never do it again, you have a deeper understanding of where your meat comes from, and there's no other way to really get that. I hope you'll continue to raise your own, though, even if you pay somebody else to process them. The lives our home raised birds have are so much nicer than the factory raised ones. These days I feel guilty if I buy meat at the store.