how difficult is it to actually get into a helicopter, forget the controls up, and crash it straight into the ground.
Not very hard
Actually if you have decent experience with flying helicopters on PC games, it's really easy. Basically WASD controls tilt, XC are rudder, and QZ are raise and lower altitude. Though you can swap WASD for mouse axis and it gets 10x easier.
45 min of arma helicopter piloting and I mastered it.
Plus only people who know how to fly it are allowed to.