Agreed the P51 isn't going to last long even in the hands of a pilot with lots of natural talent but no acquired skills. That said, do what you want to and have a great time. Just be sure you pick a flying space that's about twice as big as you think it will need to be, and make sure it's really far away from any people or property. A shortage of trees is also highly recommended. One small tip that has made the hobby easier for lots of headstrong newbies is to stuff a trash bag into the fuselage somewhere. It's really convenient when you get to the crash site to already have something to stuff the parts into to carry back to your car.