I let my eggs sit on my counter no longer than 10 days and turn my incubator on 24 hrs before I put my eggs in it. I used to use a styrofoam incubator, but now have a cabinet incubator. I still use the styrofoam incubator as a hatcher. I don't worry about the temp of the eggs before they go into the incubator. Here is a picture of my last hatch.
