And one other item, don't just look at losing hands... look at all hands... any that you had second thoughts on, any that you took time to make a decision on, and some random hands that you played in to see if you still agree with the way you played it...

Now, with that said, I don't have the discipline to follow it, though it was advice I was given (I spend little to no time studying at this point, since I have moved to a more casual playing style).