I have been doing this for about three years now in the United States. Basically, bought property ($6000), built small dome to live in ($3000), went half time at work (4 hours a day doing low stress programming). I make about $17,000 a year and live pretty comfortably on that. The key is having no debts, eliminating as many recurring payments as possible (I pay about $300/mo for all utilities and phone), drive as little as possible and don't eat out much.
I even wrote a blog about it. http://www.minimalintentions.com/search/label/Geodesic%20Dome
My plan was that when I had all this free time I could work on my own projects (of which I have many). Unfortunately turns out that I am pretty lazy so instead I sit in a hammock and read books more... ah well... I still plan to get motivated at some point... eventually.
(repost since I was logged out the first time)