Well done - great to hear you are 'getting' it! I'd certainly agree with the second reply - it takes time to fully implement GTD. I'm still certainly refining it for myself, and on my journey I've gone down paths that have been dead ends in terms of applying it effectively. I'd say most of these are where I've tried a new tool or modification of a tool, which has invariably overcomplicated my process. The most important thing once you have the 'a ha' moment on the methodology is to have a system that is as simple as you can make it, but as detailed as it needs to be to properly manage yourself. The more complexity you build, the more risk it will fall over.
Do, or do not. There is no try.