I think this is one of the most difficult issues for most of us in our modern urban culture, to calmly & intentionally kill an animal that we're neither threatened by, afraid of, or disgusted by. We've gotten so far removed from the sources of our food and thus have little awareness of or appreciation for the sacrifices, both animal & human, made on our behalf for the meat on our plates.
I think this is one of the reasons for the problems that occur with mass-produced foods, the samonella & mad cow diseases, because as a society we push these unpleasant but necessary procedures to the margins of our awareness. We assume "someone" is taking care of everything on our behalf, and we just want to drive up to a building and obtain a hot meat sandwich for a dollar with a minimum of human contact.
With my meat birds, I try to consider them like the produce grown in my garden. I've given them the best care from their earliest days, admired their natural attractiveness, taken pride in their growth, and anticipated their goodness upon harvest. I give my birds gentle handling and kind words right up to the end, something few animals receive before they're dispatched.
I am glad to have mastered this basic human survival skill, to process my chickens by myself. I feel like the Tom Hanks character in
Cast Away after he built his first fire by hand. Remember how he danced & sang around that fire, boasting to the world "I...Made...FIRE!!!" I don't actually dance & sing around the table, but I do feel a sense of pride. "I...Made...FOOD! Me! I made meat to eat!!!"
And it certainly adds to the enjoyment of the meal knowing the chicken you're eating won't appear on the nightly news as the subject of a recall, knowing those birds enjoyed kind handling, healthy food, pleasant surroundings, and humane processing.
Let us know how things go. How many are you doing? Are they big enough at just 13 weeks? I do my standard breeds later, at least 16 weeks, more like 18-22 weeks. Maybe you don't need to do them all right now, let some "ripen" a bit more.
Enjoy your well-earned chicken dinners!