You've got to be a Football Fan
As an avid football fan, I try to see every game jets
play. Whenever I have the chance to cajole my father into
accompanying me, I try to do so. He only has rudimentary 
knowledge of the game. Since I am steeped in it, I enjoy
explaining its intricate details. It certainly enhances 
your appreciation of this game if you are aware of every
nuance of the game.

To beard the lion in his den--Having decided to beard the lion,
I stormed into the manager's office to ask for a raise.
(to visit and oppose a person on his own grounds)