If you time block your available time as he does, you're forced to make choices--there is only so much time available, obviously--and the discipline starts to emerge by that simple process.
Start here, but spend an afternoon going through his articles when you have a free chunk of time. If it resonates with you, and you adopt some of these strategies your focus and productivity will both improve.
http://calnewport.com/blog/2013/12/21/deep-habits-the-import...