Do your best not to set up under dead tree or dead limbs, or where an obviously leaning tree or snag may fall.
Then hope for the best.
Reality is......trees and limbs fall all the time in the woods, and there isnt a lot you can do about it. Chances are very slim it will happen to you. It DOES happen to people from time to time though.
You can accept the risk, or stay home. Not much in-between.