try pulling off the membrane very slowly maybe using a little warm water to wet it. be careful because there could be bleeding. Hope it's okay.
I have done this a few times with eggs from the bator. once with a broody chick. I use warm water on a paper towel. I wold say the process takes me about 10 to 15 minutes. Re warming the paper towel as needed. once the membrane is good and wet, it pulls off pretty easily.