On our first trip, my buddy got to fly shotgun. The pilot told him he needed help during the flight and asked my buddy if he would help. The answer of course was a nervous "yes". The pilot then told him, " Okay, don't touch that, that, that, or that. Don't touch anything. Understood?"
It is a beautiful flight, the planes are workhorses and you have less to worry about than flying on a big jet.