Cool means being able to hang with yourself. All you have to ask yourself is 'Is there anybody I`m afraid of? Is there anybody who if I walked into a room and saw, I`d get nervous?' If not, then you`re cool.
When people ask me, "Who was the toughest pitcher you ever faced?", I have to say that there has never been a pitcher who over-impressed me. That's not meant to be a bragging statement. It's just that I get up for good pitchers.