The most common mistake you'll make is forgetting to keep your own scorecard. Very little at work reinforces your ability to do this, so you will have to be vigilant. When evaluators give you an assessment, they are just guessing at who you are; they certainly are not the ones who know your potential. They can rate you and influence you, but they don't get to define you. That's your most honorable assignment: to define, every day through the way you deliver your work, the scope and nature of your inherent abilities.