One of the most important ways to PREPARE for anything is to PREPARE your brain to handle the challenges you may face. Hope for the best and prepare for the worst. It is unrealistic to expect to be completely prepared for every situation. However, it is realistic to PREPARE our minds for the possible emotions and feelings that we may encounter. Doubt, fear, insecurity, anxiety are all potential speedbumps that we should prepare for.
"Successful people have fear, successful people have doubts, and successful people have worries. They just don't let these feelings stop them." -T. Harv Eker