If you're like me, you finish all the smaller tasks before conquering the largest. You get a sense of accomplishment marking those to-do's off your list. But when it comes to the big one, it's hard to get started.
No matter how overwhelming the project may be, there is a first step. Opening the word processor, flipping to page one, making the first call; these may be a small percentage of the task, but you can accomplish them quickly.
Start small, get the first step done. Be encouraged, and take the next one.