If your bator is setup correctly you shouldnt have to plan for it to screw up. I would get the temp in the 101-102 range on top of the eggs, make sure it stays there and go for it. Could also add some stuff to act like a heat sink so you dont lose temp when opened.
I know, I am having no problems with it... YET.
I did, but I was told otherwise on my thread and I was told I should leave some room so a temp spike would not kill them since I am using a styro.
I am using a probe to see what the internal temp of an egg would be, but I won't put too much stock in it as it is an old probe and I don't know if I did it right....