Whether you were recently being appointed as a leader in your church (one of the elders, a cell group leader, or an event coordinator) or you have been one for a while, it does not matter. Our attributes and values can change any time and it is important to keep them in check. To keep them focused on God and God alone.
A good leader is kinda different from a good Christian leader. You can find lots of tips from books or secular leadership seminars on how to become a good leader. For example, to be a good leader, you need to lead by examples, inspiring, motivating, positive thinker, and so on. If you stop there, then Osama bin Laden, Napoleon, or Hitler was a good leader, right? They even had followers who were loyal to the death.