Before you bail put a "business plan" together.
How much (how little) do you need to earn to meet your living expenses? What can you do to earn that amount while you work on your project? What skills can you market? To whom?
When I left my full time job, I was able to freelance write for tech pubs and blogs, and my partner hacked code in a developer-for-hire position. Look for the kinds of jobs where you can manage your time, schedule and how much you earn.