One point the article made was that scheduling is key, especially is self-discipline isn't your strong point (and believe me, it isn't a strong point of mine). So I decided that, before going to bed, I would create a schedule for the following day (that is, today) and stick to it. There were a few bumps along the road that required moving some things around but now it's 7:00 PM and I've managed to complete everything on the list up until this point.
From now on, I will be explicitly scheduling free time (I actually have some coming up in about 30 minutes).