I have been planning getting Quail primarily for eggs for a while, but, they only have a good production life of about a year, so I know that I will be hatching quite a few to keep the stock fresh. The ones I want you can tell male from female around 4 weeks, laying eggs at 6 weeks, and they are fully adult at 8 weeks, so my plan is to keep them all together for 4 weeks, separate out the "boys" and put the boys in one area and the girls in the other for the next 4 weeks, check for any eggs in the boys pen and for any rooster feathers in the girl pen for those 4 weeks, then process the extra boys at 8 weeks old and put the girls in their cages that they will live in (roll out wire bottom cages for the egg layers).
I have helped process deer that my dad has killed, but they are already dead, gutted, and cold when I first see them, so, Dad is willing to kill the birds for me, so at first, I plan to have him kill 1-2 at a time, and then I will process from a dead bird, only 1-2 at a time so that if I get emotional about messing with a dead animal that I raised, I don't have a stack of 20 birds to deal with and if I just can't do it, I can toss the bodies to my cats and let them dispose of them. Once I am comfortable with gutting and plucking or skinning them in fairly large numbers, I will work up to killing my own. I have never killed a real animal and even feel bad about killing bugs, so starting with a dead but still warm animal is how I will start so that I can work up to it.