Getting Things Done isn’t just about lists, or 20 simple steps to make your life amazing GTD is a set of tools and methodology that can be used by anyone to bring some control back to their lives.
When you implement GTD you develop an awareness of what is going on in your life, and the demands that are being made of your time. The number of these demands are what leads David Allen to compare GTD to a martial art, as you are constantly in combat with all of them.
Extended this metaphor there is the concept of GTD mastery or being a black belt in GTD. this is how I earned my yellow belt.