I talk to and pet my death row pen roosters from the time they are hatched so they are used to being handled and have no idea what is about to take place.
I just pick one up and carry it to the chopping block, there's no squawking, flapping, commotion or excitement, hook his head between the nails and swing the hatchet. While he's flopping about on the ground I'm walking back to the pen and getting another one.
The chopping block is in full view of the rest of the chickens but they don't get alarmed at all. Matter of fact, my yard chickens hang around and as soon as a roosters head hits the ground another chicken grabs it and runs off with it. The other chickens and the cats eat EVERYTHING while I'm processing and when I'm done all that's left is a pile of feathers and feet. There's no mess to clean up or dispose of and it was just another uneventful day.