How long have you been flying your trainer? Have you ever flown a low wing tail dragger before? If you have never flown a low wing tail dragger, you might want to pick one up to practice for at least a couple of months before jumping into warbirds. When you are proficient at taking off, flying, and landing a low wing sport plane, then it's time to take a look at a P-51, Spitfire, or P-40.