It should dry up and fall off on it's own. I've heard of people clipping it off really close to the shell and letting the rest fall off on it's own. Them dragging the shell around can cause issues.
Keep an eye on his breathing. That's how my chick went. He was trying, then just peeped a bit,then stopped and just stayed like that for about 45 minutes before I helped. I think your chick needs it.
I was super nervous too, but read that article like 5 times, then got a rag, a few q tips, a cup of warm water, and my tweezers(which I sanitized with alcohol), and say down and started chipping away. I ran into no veins, no yolk sac and no problem . Beyond the chick being splay legged. I was...
Also if you can see the chick himself make sure he is still wet. Mine started drying in the shell and hadn't made progress for over 2 hrs before I decided enough was enough, and he wasnt going to make it without help. The combo of his splay legs and getting dry and stuck made it so he couldn't...
Grab the very tippy top of it with tweezers and GENTLY pull until it rips a bit. If you see blood stop immediately and lightly touch a paper towel to it.