Dallas Mavericks owner and Shark Tank star Mark Cuban often asks contestants on the show (or makes the point to them) -- if you were you one competitor, how would you kick your own ass? 

This way of thinking can work for all of us. What are the weakness you'd exploit in yourself? How would you attack you? This reversal in thinking, instead of telling ourselves so much about how everything is OK and we are indeed great, think about the way your worst enemy -- the person who knows you best (you) -- would attack you.

You can't hide when your opponent knows every thing you're hiding.