I started with 5 day-old layer chicks that I bought at the feed store. We decided to name, and not eat, our first group of chickens, but 2 of the 5 turned out to be cockerels. So, at week 10 or so, I bought 3 more pullets so I could keep both cockerels engaged.
The original birds are very friendly with me - except sometimes the dominant male, who has started challenging me (by the way, his name is Lady, because we thought he was just a big girl!). However, the new birds keep their distance. They will be easier to eat .. except for that aggressive "Lady", whose name is quickly becoming "Chicken Dinner".
There is a farm nearby that sells free-range chickens. They allow neighbors and customers to come to the farm to participate in harvesting the birds. I've been one time, and learned how to clean them after they've been killed. I'm going back in 2 weeks to learn to actually do the kill (slit their throats when they are in a kill cone).
Handling all those dead chickens steeled up my nerves up a bit. When our dog killed one of our pullets, I was able to handle it better. I think mastering the kill will help with the inevitable day that I need to euthanize a bird, or decide to harvest one to eat. One of my first chicken experiences was during a tour of the farm where I was volunteering. The farmer accidentally stepped on a little chick and her guts smushed out her vent, hanging out there, it was gross. The farmer quickly suffocated the little chick to put her out of her misery.
Tending animals can provide opportunities to grow, and master things you didn't know you could - if you're up for that kind of challenge.