You don't have a safety net? You'll find you don't need much of one. If you have money saved up, reduce your expenses and figure out a time-frame for it to work. By the end of that time frame you can decide what you want to do. You would be surprised how well you can scrape by if you really want to.

What if the company fails? Who cares! You'll learn so much about what you are doing, yourself, and much more that you will benefit either way.