Fly the way the pro would fly. If you were riding in the back as the paid passenger on a commercial flight, would you like to think that the pilots up in the front taking selfies, or any of a number of other distracting and totally un necessary activities?
Even before selfie capabilities, I saw new pilots ('cause old pilots really did not seem to care to) with all manner of gizmos in the cockpit, many of which were terribly distracting, just focus on the flying, and enjoy it....