t's hard when you are not looking at it. The blood is the thing. If it bleeds when you try to take the membrane off, it needs to wait. if it does not bleed, them go ahead.
In the meantime, try to keep the membrane moist without drowning the chick. The humidity in your incubator should be high enough to do that, but I use those straws with the accordian joints to be able to put water in my incubator without opening it. Cut a couple of then pretty short near the joint then put them together. Put them in through a vent hole and kind of bend them after the joint is inside. It's hard to explain but in you try, you can figure it out pretty quickly. I use a syringe to put water in the straw. You can maybe direct a little WARM, not hot, water directly on the chick.
In the meantime, try to keep the membrane moist without drowning the chick. The humidity in your incubator should be high enough to do that, but I use those straws with the accordian joints to be able to put water in my incubator without opening it. Cut a couple of then pretty short near the joint then put them together. Put them in through a vent hole and kind of bend them after the joint is inside. It's hard to explain but in you try, you can figure it out pretty quickly. I use a syringe to put water in the straw. You can maybe direct a little WARM, not hot, water directly on the chick.