I would worry about tipping the whole incubator, one, because if you're in a dry climate, there should be water in there, and two, if the eggs are rolling freely, you risk breaking them when they roll from side to side. I, for one, am a klutz when it comes to handling eggs.
I just put them in a carton and block up one end of the carton to tilt it. Then every couple of hours I turn it so the other end is up. And yes, until day 18, then I lay the carton flat, raise the humidity and leave them alone until they hatch.

