If you can get to the finals and put in one good month of football you can win a premiership. Finals are about grit, determination and desperation. Finals are about self-belief. The greatest asset your opposition possesses is any lack of belief you have in yourself. If you can remove all self-doubt you effectively eliminate your opponent's greatest asset.
Finals are about toughness, both physically and mentally.
These are learned skills. No-one is born tough. It is a product of your environment and education. Finals are about defence and kicking games. Closing down the opposition's kicking game with good fifth-tackle pressure.