Good job, Egg_newton! I always seem to learn something with each butchering session that makes the next one go even easier.
I've tried several different methods and now prefer the throat-slitting method. It was hard at first to get so up-close & personal with the killing, but now I feel I'm doing them the best & final favor by giving them a quick efficient end, with kind words said right up to the very last.
I think it helps to hold their heads for the few minutes until they stop thrashing, it keeps the biggest ones from flipping out of the cone and most importantly keeps the blood from spattering all over the place. I try to collect it in a leaf-filled bucket to dump all together in the compost pile without leaving the kill station area looking so gruesome, and attracting pests.
I'm not sure why the bile gland got cut in your bird. I lay the birds on their backs, make a cut at the top of the cavity, stick my hand inside & try to scoop everything out in one big bunch towards the back. I can use scissors or a small paring knife to sever the tubes holding the gut bundle in place at the front, but everything else can be just scooped into one bunch. Then I turn the bird over and cut around the vent, around the edges of the cavity, and up through the tailbone. Then everything can be tossed in one big bundle.
Now enjoy your well-earned meal from this bird!