Hey, someone around here needs to share knowledge and save others from near tragedy!
Seriously though, get a Butt Out. It only costs about $10 and I would spend twice that for how fast it works. I take no pride in the effort it takes to get the job done the traditional way. I keep the tool + a few zip-ties in my tag bag: one to attach the tag, and the others to seal the intestine around where I plan to cut. Then Butt Out in, rectum out in seconds. Easy-peasy.

Seriously though, get a Butt Out. It only costs about $10 and I would spend twice that for how fast it works. I take no pride in the effort it takes to get the job done the traditional way. I keep the tool + a few zip-ties in my tag bag: one to attach the tag, and the others to seal the intestine around where I plan to cut. Then Butt Out in, rectum out in seconds. Easy-peasy.