I've read this thread through over the last couple of weeks. It seems to be a practical solution to the problem I have - I hatch my own eggs and around 70 - 80 % turns out to be cockerels. This past week I practiced on a 12-week old cockerel that was killed by a stray dog - and smoothly and successfully completed the task, which gave me heaps of confidence. So I reckoned I could practice on a live mutt cockerel which will not be too much of a loss should an accident occur. Apparently this cockerel has some advanced pain receptors or something but it absolutely flat-out panicked and screamed every time I attempted a cut. Also he bled a lot through just the skin cut. I did wipe the area with alcohol and there were no visible blood vessels where I made the cut (the blood vessels were visible over the whole area under the wing). There was way too much blood for me too continue - and the chicken was way too stressed. He was calm until I started cutting. I decided to release him - he really wasn't the right candidate, or I did something terribly, terribly wrong. Has anyone on this thread ever experience a chicken that panicked over the skin cut? It really seemed as though he felt extreme pain.
Alcohol stings, so that may have contributed to his struggle. If you've had blood drawn and they use alcohol, they wait for it to evaporate before puncturing the skin.
So next time let it dry some, or can you use betadine???
Just a thought.