I have now obtrained a styrofoam Little Giant still air incubator. I have a thermomoter/hydrometer inside of it. I am letting it get warmed up. but i have some questions. 1. I have 10 eggs, they were outside most of the day and it is somewhat chilly, will it make them not hatch? 2. how long do i have to let it set to place eggs inside. 3. what do i write the xs and os on it with? pen, marker, pencil? 4.It has some wholes in the top which are plugged, if/when do i unplug them for circulaton thanks in advance.