Rotate the eggs. Temperature is set to 37.5 and difference is 0.5 and humidity should be between 55% to 60% Turn the eggs one quarter to half a turn three times daily for the first 18 days. Here are some of the steps to follow to make a DIY egg incubator: Cut an Opening at a Tip of a Cooler The gap will create the socket and the light bulb in place. You want to turn then so that one side faces down and the other up. Mark one side of each egg with "X" and the other side with an "O" to keep track of which side is facing up. What you need to do is to put the hollow from the lamp. Put a cotton cloth inside the box and put eggs on it,also put water in a plastic bowl under the bulb so it will be warm and make humidity.