Mine is a large homemade bator made from a sink cabinet. It opens at the top. I have an old blanket hanging over it and I crawl under the blanket and pull it down over my hips and then open the bator lid. The blanket keeps the heat and moisture from escaping fast. I have even had the lights turn off on me while checking the eggs because the temps were holding so well. It has worked really well for me.
I think though that I am going to go ahead and build out my old dishwasher as an incubator and donate this one to a 4-H kid. This is because I have gastric reflux and to reach the bottom of this bator I have to be in the toe-touching position with the wall of the bator digging into my belly and fighting reflux at the same time.