When mine get halfway through the 22 day, I start checking and assisting. I pick open the large end carefully and take a look inside. I moisten the membrane with water to keep it flexible and make sure it stays soft. if the chick is moving at all, I will expose it's head and beak and let it be. If it seems dry, I will moisten it with warmed water. I will check again in a few hours. If it is not trying to move, I will gently peel small parts of the shell away. Moistening if need be. Sometimes, the chick seems stuck and wetting the membrane to soften it helps it to get loose. I have yet to lose a chick I have helped but you have to be very gentle and slow. I would rather try and help then have them die in the shell. I only have had issues with shipped eggs. Any of my own eggs all hatch on time with no issues.