By far the most difficult thing was learning to keep track of everything going on while you are flying. What you have to understand is the flying a fighter jet involves a lot more than just flying the jet. You have to keep track of your fuel, the weather, your wingman, the bad guys, the other friendly jets in the air, and then you have to be able to employ your jet for whatever mission you are there for. When people ask me what I can do to prepare for flying a fighter jet, I tell them to start small. Believe it or not, I suggest getting a computer program like flight simulator. Practice flying! Then, add in bad weather, aircraft problems, other challenges. Another thing you can do, is to practice keeping the "big picture." No matter what you are doing in your day to day life, if you are focused on a task, always ask yourself, "What am I missing." Get used to being the leader in any situation and don't get too focused on one thing. If you get a chance, check out my book at www.scrambledthebook.com I hope this helped!