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I would wait until your hatch is done. How many are left that need to pip? How many to zip? How long has it been since you noticed that some may be stuck?
Chicks are good for at least 48 hours but staying too long stuck in the shell can make them weak from effort. When you are sure that any that can and will hatch by themselves are finished, then it is time to take the stuck ones out one at a time and help.
It isn't hard, but it does take time and you have to be very careful to know when to let the chick rest again in the bator before going further.
You can't just pull them out. They could easily bleed to death. You need to go slow, keep them warm, and watch for blood as you get them out.
I get a plate, tweezers, my glasses and a spray bottle filled with warm water. Start with the oldest pip first. This is how I do it. I take it out and gently start removing the hard outer shell leaving the membrane intact. I do this about 1/4 to 1/3 of the egg.
Then I start at the pip and remove a little of the tough outer membrane. I spray the warm water on the chick and egg to soften the membrane, but don't drown the chick in the water
Spraying also helps you see the blood veins. After you have some of the tough membrane pulled back, try VERY CAREFULLY to remove a little of the inner membrane. This is where they can bleed to death so go slow.
If you can see the veins well then going slow is extra important. You may need to pull some back until you see blood. At the first sign of blood, spray it with a little warm water and put the chick back in the incubator to rest. Then the blood veins start to dry up.
Keep going back and working somemore every hour or so. Put them back in often so they can get warm.
Then work on other chicks as you let the ones you have worked on rest.
If there are no pips in the egg, candle it to see if you can detect movement.
If no movement, carefully open the egg a little and listen for peeps. If no peeps open a little more to see if it has died in the shell.
Keep going until all chicks are out.
Sometimes after you get about 1/2 the shell off, you can slip the chick out from the membranes and they are just fine. You may have to give them a warm water bath to get the goo off.
Do it quick and keep them warm. Put them back in the bator until they are fluffed and walking.