You've worked hard, sacrificed and devoted yourself to your career. Now you are enjoying your success, feeling confident. Don't get too comfortable. Leadership expert Marshall Goldsmith reminds you that the very traits that enabled you to become successful might lead to your downfall. Now that you are a leader, your behavioral quirks and weaknesses take on more weight and significance, and can do more harm than they could when you were an up-and-comer. Goldsmith identifies the 20 most common shortcomings and provides a seven-step procedure for improving without a complete personal makeover. Usually, making a small adjustment or simply stopping the negative behavior is all it takes.