For me, the biggest obstacle to getting my weekly review done was that it was a large, amorphous task. Where should I start? How big would it be? How long would it take? It was much nicer to just avoid it than to actually tackle it.

Then I realized that GTD told me how to approach things like this: break big projects into a series of steps. Now, I have exactly 18 steps that I do, in order, every Friday afternoon. I'm very specific -- I specify each inbox I need to look at, each planning tool I need to use, and so forth.

Whenever my review seems big, I just make myself promise to start with step 1. And step 1 usually takes 5 minutes. Then the other 17 don't seem so big! And it all just moves along.

As a positive side effect, having a list of things I do makes it easy to track what organizational tools are and aren't working from one week to the next, and try out new techniques without worrying about forgetting them.