I use a gallon milk jug for a killing cone... Cut the bottom off the jug and cut out around the mouth of the jug. Hang it bottom up. I hold my chickens upside down while I'm taking them to the "cone"...I hold their head straight down from their body. They kind of faint. I insert them in the jug, drawing their head and neck down through the hole. When I cup their head in my hand, usually they close their eyes and more or less faint. Then I use the awl to pierce the brain, through the back of the mouth. If I get it right, they ARE easier to drypick than birds killed other ways. If you're gonna scald them, it doesn't really matter which kill method you use. After I kill their brain, I cut their throat and bleed them into a receptacle while they are still in the cone. Then I finish taking the head off, and pull them out of the cone and drain the last of the blood over the bucket.
Good luck with yours. oh, yeah...if you let them, they would still kick and flog -- I keep them in the cone until their body tremors all are over.