Finding a person that is able to travel is the first step. Then it becomes a matter of being able to get along and being considerate.
I have hunted out of state DIY for the last 15 years. I have hunted with several guys,there has only been one bad apple.
I am not selfish per se and I enjoying seeing someone else be successful, even if once and a while they haven't put the effort in to it that I have.
Don't go in to any thing blindly and cover all your bases but there are plenty of decent people out there.