I'll try to summarize the positions by taking (IMO) the most representative paragraph from each one.

1) Yvain:

The technique I decided to test was to write out an oath detailing exactly what I wanted to do, list in nauseating detail all of the conditions under which I could or could not be released from this oath, and then bind myself to it, with the knowledge that if I succeeded I would have a great method of self-improvement and if I failed I would be dooming myself to a life of laziness forever.

2) Z_M_Davis:

Rather than setting explicit measurable goals, I try to continually remind myself that every minute and every dime is precious, and every minute and every dime that you don't spend doing the best thing you can possibly be doing is a mark of sin upon your soul.

3) pjeby:

If you explicitly contemplate all the things that might come up, and decide what you'll do in each case, then you are mentally linking your "interest" to those contexts, along with a preferred behavior... thus reducing the willpower load required to make those decisions when the time comes, and giving that "interest" a larger say in the bargaining that occurs at that point in time.

Now we need to understand what implications those positions have and where they contradict.