Yolk is gone and all that’s left is the umbilical cord and some egg goo, so that’s good. If the membrane is stuck to the feathers then use some warm water and paper towel to sorta rub it off. Try to avoid messing with the umbilical area. Take short breaks to let the chick rest a little but keep working at it till all the moving parts are free. I do worry that it isn’t stretching out his/her neck but if it was stuck for a while then maybe it just needs time. Worse case scenario, the chick is malformed or has wry neck. Hope for the best but be prepared for the worst.
I’ve had to help one of my own eggs hatch as it was pretty much shrink wrapped in the egg, it never externally pipped. Little gal was covered in sticky goo that I had to gently wash off, a soft paint brush helped. It still took a couple days before she was out of the woods but she’s fine now and I’ve got 3 of her eggs about to hatch right now.