Office Hours: Achieving Diligence in the Classroom

We've all been there before. We begin the year with such enthusiasm, but just a few weeks (days?) in finds us behind schedule, overbooked, and overwhelmed. And yes, we know that grace is sufficient and our identity is not hanging on our failure or success...but still, some things would certainly be a lot easier if we could cultivate a little diligence in our classroom. How can we do that? Where does diligence come from and how can we ensure its survival?