Someone very near and dear to my heart gave me this gentle reminder regarding incubating eggs...
"Keep your grubby mitts OFF of them!"
It's hard to watch them struggling, but they can do it. I had a small pip in one egg at 11am, and the chick didn't fully zip until 8:30am the following morning. You don't want to open the incubator/hatcher, because the humidity will drop, making the membranes stick to the chick.
Now, having said that, we did have one chick that busted out, but the shell WAS stuck to the chick, and I had to finally help loosen it from the fuzz. But sometimes they pip, then don't do anything for a while... they just gather strength to get out. It's nerve wracking, but suck a wonderful thing.
The same person that gave me the reminder also said that he tries to be gone when the chicks are due so that he won't be tempted to help.
Congratulations!