Everyone's how is going to be different and probably not applicable to your situation but here is what you can do...just make it fucking happen. This small piece of advice may not seem that helpful but what I'm trying to say is you're nuking it. You're over thinking. Jump in head first and see what happens.

On that note, I don't recommend any plan that involves your parents, but that's just my undying need for self-reliance.

If you really want to know what I do to survive, nothing special really. I cut back my costs but don't eat only ramen and live in a box. I pick up some consulting and freelance jobs and help out people with other stuff when I'm in need (menial labor can be a good thing). The key is flexibility. I think about my company 24/7, but there is no way I can work on it that much. There is more than enough time in the day to make a living wage and work on your startup full-time, just make it happen.