My friend & I have only been processing our roos for about 9 months now, and with each session Learning Ways to Improve Next Time. By the time we're both Grannies we'll be really really good.
It helps to have all our tools & equipment collected & handy beforehand. We're keeping a list of the things we need, and trying to keep them in one place in-between times. We each have a metal porch swing frame in our yards that we use for hanging the birds by their feet while plucking.
Plucking isn't such a bad job if you get a good scald first. We have some big stock pots that we boil water in on the stove, then keep hot on the BBQ. We use a meat thermometer to check the temp. Hanging the birds from the frame allows us to use both hands for plucking.
We withhold food, but not water, the day before so there's less nasty surprises inside them. And I always have them in wire cages by the night before so they can't even eat the grass. I wouldn't attempt chasing birds around the yard right before processing them.
We've used both the chop and the yank methods. Used machetes, axes, and cleavers. We haven't tried hypnotizing them, just put their heads between 2 screws on the stump to hold them in place. One person pulls on the legs, sometimes also holding the head down with a stick, while the other chops. The best way to chop is with something both heavy & sharp, and give a good strong decisive whack.
But we've agreed that we're going to try the slice method next time, to see if the birds bleed out more thoroughly and taste better. Must you use a cone if you're slicing? Is that just to keep the bird from flapping & flipping & spraying its blood everywhere? What about pulling a toeless sock over the bird like a jacket, zip-tying its legs together and hanging it up over a bucket?
We've just done mixed-breed and standard-breed roos, at 20 weeks when they've reached their full sizes. They've been nice & tender & tasty. I let them rest in the refrigerator for 2-3 days, then slowly simmer them in water or broth for 2 hours or so, until the meat just melts off the bones. Then I separate the white from the dark, and freeze for later or enjoy right away.
Now I'm hungry for chicken...