Also not an expert, but you can draw the air cells if you want, for a newbie (like me!) it can help us learn as well as ensure proper incubator behavior. A broody hen leaves her nest a few times a day for 30 minutes or so to eat, drink, and poop, so don't be afraid to open your incubator up and candle them when you need to. Take your time but don't dally. And if you're taking too long to do them all and have tons of eggs, do half of them, put the top back on, and come back in 8 hours or so to finish the rest. If it has a blood ring, it is dead. Otherwise wait a few more days or until you smell something to start throwing things out, I have an egg in my incubator right now that showed late vascularity but appears to be on track now. If you smell something though, get the offending egg out asap. You definitely do not want the dreaded exploding egg!