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. Limiting their attacking kicks by maintaining good field position. Planning and executing your own kicking options. The vast majority of tries scored in finals over the past five years have come as a direct result of rehearsed kicking options. Finals are about speed.