May be a little late, but I'll throw my comments in, too.
I'm almost a year in my "temporary" dwelling, a metal building finished out inside to a 400 sqft apartment and a 600 sqft shop. Gotta keep the priorities straight! I've been more or less living here since the shell became watertight. Contracted out the septic and the concrete...got a crew of friends to help put up the metal shell between Christmas and New Year's, last year. Since then, it's been all my own two little hands. Just now finishing with a lot of interior stuff like cabinets and so on. In a few years I'll be doing the "real house", and I plan to do that about the same way.
For me, the whole project grew out of wanting to live out - way out - and a conviction that I ought not be in debt. Well, now I'm not, and I love it. As someone else mentioned, there is an element of proving something to myself, too.
That's one thing that is key, I think, in doing a job like this myself - I LOVE IT. Carpentry, plumbing, electrical, I love all of it. Working on the house is my R&R. I get home from work and go right into building.
Oh. One other key. At least most folks I talk to jump right on this point when I talk about the track I'm on. I'm not married. ;-)
Steve