Here is the link.

Some interesting parts:

The way to build self-discipline is analogous to using progressive weight training to build muscle. This means lifting weights that are close to your limit. Note that when you weight train, you lift weights that are within your ability to lift. You push your muscles until they fail, and then you rest.

Comment:  This seems to be true for some things, but not others.  Example:  I can be disciplined for meditation and exercise, but not, say, IT study.

It’s a mistake to try to push yourself too hard when trying to build self-discipline. If you try to transform your entire life overnight by setting dozens of new goals for yourself and expecting yourself to follow through consistency starting the very next day, you’re almost certain to fail. This is like a person going to the gym for the first time ever and packing 300 pounds on the bench press. You will only look silly.

Again, I'm not sure how true this is.  If I set a goal of 30 minutes meditation, and 30 minutes exercise, I will do those goals, but if I set a goal of 10 minutes guitar playing (which I love) or 10 minutes IT study (which is okay, interesting), that I don't do.

So something else is going on, besides building the "self-discipline" muscle.

Similarly, if you’re very undisciplined right now, you can still use what little discipline you have to build more. The more disciplined you become, the easier life gets. Challenges that were once impossible for you will eventually seem like child’s play. As you get stronger, the same weights will seem lighter and lighter.

Perhaps you try to work a solid 8-hour day without succumbing to distractions, and you can only do it once. The next day you fail utterly. That’s OK. You did one rep of 8 hours. Two is too much for you. So cut back a bit. What duration would allow you to successfully do 5 reps (i.e. a whole week)? Could you work with concentration for one hour a day, five days in a row? If you can’t do that, cut back to 30 minutes or whatever you can do. If you succeed (or if you feel that would be too easy), then increase the challenge (i.e. the resistance).

That example simply isn't my reality.  My own experience is, you truly need at least 30 days, maybe 90, for a new practice to become habitual.  (This is also something that Pavlina says, which is true, in my experience.)

But what will happen with a "new" practice, practiced independently, is that I'll keep it up for a few days, then fall off the wagon, then sporadically continue, until I give up again. (Or come back to that practice a couple of weeks later.)

So, in my case at least (and I'm being honest here about my lack of self-discipline) it seems to me that there are two options, for those who obviously never learned true self-discipline, but simply learned enough to "get by". 

a.  Immersion:  Especially for any new trait, the "AA" route is useful.  Full immersion, and daily support, for the new trait you are attempting to instill - until it becomes a habit.
b. Immersion again - in a program to learn "self-discipline" as a trait, in and of itself, separate from any actual practice.
c.  Bill mentioned this once - work with one's psychology, or inner voices, to understand what inside of one's psychology is indulging in self-sabatoge of growth. 

I would criticize Stve Pavlina, actually, from presenting a "system", or a guide of how-to's, that in a lot of ways, "assumes the close".  Meaning, assumes the self-discipline already exists, with which to "improve".
The A to B straight line of self-improvement that Pavlina endorses, while sounding wonderful, glosses over the challenges to the "normal" person.  As such, is of very limited use, to effectively creating change.