Get deep into the habit of personal introspection.
Ben Franklin called this one of the most important strategies for personal effectiveness.
Spend ten minutes every night before you go to bed in self-examination.
Think about the good things you did during the day and the bad actions you may have taken which you must change in order to excel and grow.
Successful people are simply more thoughtful than others.
Daily reflection will soon allow for the eradication of your negative qualities (ranging from procrastination to gossiping to insulting others) and will sharpen the mind.
After steady practice, a time will eventually arrive when the mistakes you makes are few indeed and your personal power will move to the highest level.