I should say, though, that I've seen two routes toward FI that resonate with me: one is ultra minimalism, and one is more like MMM. The ultra minimalism is pretty straightforward.. don't do much, don't need much, don't spend much. It doesn't really fit my personality, as I love to learn and get my hands dirty actually doing things, so I land more in the MMM end of things.
Of course, at my current rate I'm 17 years from FI, but that's another story.