Sometimes we have big battles to fight; sometimes we have small battles to fight. Sometimes we fight battles that are not ours to fight.
Always keep in mind who has the battle to fight. Ask yourself who owns the fighting of the battle.
Many times it's not you, you're just caught in the middle.
Let those who are fighting and those who have the authority to make (and enforce) decisions be the ones to make the decisions and fight the battles. Realize the times when you are "only the messenger." And, when you are the messenger, remember where your allegiance lies.
What are your pointers of fighting battles or when you find yourself fighting a battle that isn't really yours to fight? What about pointers on being the messenger?