there are youtube videos that demonstrate the same thing as you wrote so if there is any questions it's easy to find Polyface farms have several videos on the steps on how to process a chicken. it is shown on a large scale as a tour so it's broken up in several seperate parts, but it's well worthwhile.Yes, I should have said the one gallon jug. I don't have chickens, but it's been large enough for me to use on a Silver Appleyard drake, which should be as big as any chicken you'll want to do. Of course, ducks have kind of long necks. I just shove their head into the jug while holding their wings close to their body with the other arm. Then I reach up into the bottom of the jug and grab their bill and pull down while guiding the body and wings into the top. Once the head is out I use a very sharp knife to cut their throat and they bleed out into the bucket I put under their before the whole process got started. It doesn't take long at all and they are very calm and quiet while it is happening. They don't like getting put into the jug but once there they get very quiet.
I showed this process to my cousin from South Louisiana who was raised killing chickens with a hatchet on a stump, and then letting them run around bleeding everywhere afterwards. He was amazed at how easy it was and how well it worked. He went home and told all his friends about it and they were just in awe. A lowly vinegar jug.....But it does make the whole process much easier and calmer, and there are no broken wings or damaged body parts.