focus on learning noe thing at a time always. i.e. basic maneuvers, or cv landing, but never more than one. when you choose one, do NOT give up on it. When I first flew the F4U, i focused on CV landings first and made sure I could do it efficiently. It gave me an idea of the stall characteristics of my aircraft.
Also, don't fly a plane because it's 'uber' in the game. Fly it because you've always loved it. If the P-38 is too hard, keep flying it. If you've always loved the Spitfire and everyone's yelling at yor for being a noob, keep flying the Spitfire. It's a game, have fun and do so honorably.