Poker Tracker is a great tool to see if you are winning or losing playing your blinds. It tells
you how many times you've called raises or steals in your blind and what hands you've played.
The blinds are where most players make the most mistakes as you are out of position with some money already in the pot. It's tricky because you don't want players getting the impression they can steal your blind all the time, but you also don't want to play marginal hands.