Hatchlings are pretty simple. Put baby in a folded paper towel then into a sandwich bag, note where head is. It will be still and calm because it is dark and safe in there. Completely smash head with any tool or your thumb. It does not take much to do and the towel should be wet when the job is done well. It is very fast and the hatchlings that I have done this way due to severe kinking and jaw deformaties have gone very fast with nearly no twitching afterwards. Since it is already in a bag, there is no mess or gore to see. It happens, even when you have done everything right.