There are three sections in Getting Things Done. Section number one provides a summary of the entire process for getting more accomplished in a calmer manner. In the second section, there are specifics regarding how to go about putting the process into practice. Finally, the third section offers ideas to help you recognize the value of following Allen's method.
The bottom line is that you should write yourself a note—literally, not mentally—about everything: new tasks, promises you make, grand ideas. File these notes away, but not too far away; you are going to be working with them.
When you go through your file, make a decision as to what needs to be done next with regard to each note you have made. Imagine this as a five-step process:
Step 1: Collect.
Step 2: Process.
Step 3: Organize.
Step 4: Decide.
Step 5: Act.
This is not difficult in and of itself; it's finding the discipline to follow through that we find most difficult.
There is a little something for everyone in Getting Things Done. There are charts and graphs. There are also passages that deal with stress and emotions. Whatever you need on any particular day, it's there. I like the fact that I can use good old-fashioned paper and pencil to organize my thoughts; I don't have to invest in a Palm Pilot!