I am following the hatching instructions I got from the BYC Learning Center. It says candling at 7th day, which is today. Ok, but how do I keep the eggs warm during this process? I am concerned about the batch in the incubator as well as the individual egg I'm candling. I've never candled before, have a brand new candler (LED type), but you're also supposed to mark each egg for its air sac level. That is all going to take some time. I'm having trouble visualizing this. What is the process? I have a styrofoam Hova-Bator with single big clear window on top. Thanks for any input.