Hi
Well I have looked through this thread and this is what I do before I fly with an other Pilot no mater what their experience or ratings
1Run through the planed route / detail
2Discus the weather
3In an emergency decide who is going to fly the aeroplane and who is going to do the radio after that both check to see if we have not done some think silly.
4Who logs the time / P1
5Who “ fly’s / navigate “
It’s a basic brief but it works
I hope this helps