Mike, let me ask you some questions:
1) How would you react to a 12 year old driving a car down the freeway?
2) Along that same line of thought, how do you think others in a park would react to a beginner(regardless of age) showing up at a park with a foam aircraft that hasn't had any instruction on or any clue on how to fly it?
Now, thinking ahead, you want to fly a B-17. You could have to deal with differential thrust, retracting gear, flaps and a whole lot bigger aircraft. Think 12 year old trying to drive a tractor/trailer rig in downtown city traffic. That is an approximation of what COULD RESULT unless someone shows you the ropes from the beginning