Once you know your target level of savings and/or location-independent income, work towards it with everything you have. This may involve killing your day job off immediately in order to free up more time to work for it. This may mean setting a financial goal for the day you can put your two weeks in.

Get creative and don't have an ego about it. A friend of mine decided to throw himself into this lifestyle 100% and moved back in with his parents for almost a year before he got on his feet and running. I lived on a friend's couch for a while. Later I moved back in with my mother until I had enough money to buy a plane ticket to Argentina. Once I was there I could live well off about half the income I needed to live in the US. From there I built my business up further.

But, as I said, planning will only take you so far. Plan the best you can, but then throw yourself into the fire. Leave yourself no option but to come out on top. It will be hard and nerve-wracking, but that's how you grow. That's how you squeeze all of the juice out of life. Terrify yourself. Then laugh about it.