A couple of months ago I wrote a post called "1 Simple Graph is the Secret to Success in Getting Things Done," and I must admit... I wasn't entirely honest with you. That one graph is not the only secret to success in GTD. Unfortunately; it's a bit more complicated.
If you think you don't have the time to read books, then you should read "Getting Things Done" by David Allen, and you will have the time for everything. This book changes lives and sets people free, just like they were children again.