Well, I'm certainly no expert in incubating, as this is only my second try and I failed miserably at my first. But I think I'm armed a little better with knowledge this time around. Let me share what I know/have learned.
First and foremost, make sure your incubator has a stable temperature. It's hard, but it can be done.
Do NOT put to much water in your incubator. That was my mistake the first time around, and I drowned the chick. I'm actually trying the dry hatch method this time around.
Make sure you rotate your eggs 2 to 3 times a day, mark them X on one side O on the other.
You should candle them at about day 7-10 to see if your chick is forming, if yes you'll see lots of veins in the egg.
On day 18 is when you add water and then forget about the incubator until day 21. Meaning, no more rotation and no opening of the incubator. Your eggs will hatch on day 21, look but don't touch, leave the chicks in there until they are dry, which should be about a day. You can have some late hatchers, that can go up to day 23. Any eggs not hatched on day 23, will never hatch
Now, I'm by no means an expert at incubating eggs, I have yet to see a chick hatch, I'm just sharing information I found on this awesome website.
Hope this helps a bit.