Here is what I do step by step...
Get a warm washclothes and put it on the membrane and let it get soft for a little bit. Then I would start to slowly pick the shell of the egg, bit by bit, until I saw blood, if no blood I would get about half the shell off. Then with the membrane soft and...
I hope somebody gives you a better answer than mine but I would keep it warm and moisten the membrane so that is it easier to get through there. You can slowly pick the shell off but the first sign of blood you need to stop.
Some people would let nature take its course, that is probably best...