Our family just processed our first 2 meat chickens last week. There were mixed emotions the entire 8 weeks while they were getting ready! We couldn't help getting attached to any of our chickens. Even the Cornish X we had, had unique and funny personalities. However, I always told my son (10 yrs old) the following -and it helped me to justify it too:
1) These chickens aren't breed to have long, healthy lives as pets...They would die of heart failure or broken legs if you let them live too long.
2) We are giving them the best life a meat chicken could have -humanely speaking...We've watched Food Inc. and seen the contrast.
3) By last week, my son was reciting these reminders to me. I think he could sense my apprehension.
My husband did the actual killing. But once the blood was drained, I brought out the hot water. We all helped in the plucking. By this time, the chicken really begins to look like a supermarket chicken and you remind yourself of the purpose you've decided to do this...to provide food for your family. I also helped with the gutting. It was actually interesting to see the beautiful little organs and how they are attached. You'll probably surprise yourself (like I did) and have a peaceful feeling about this whole process. Good Luck!