I don't have the answer to that, but I just interviewed someone who knows what you're going through. If you'd like, you can listen to the audio at http://www.laresearchcouncil.com/?page_id=7. Hope it helps.
I just did an interview with a successful entrepreneur (she was on Oprah for goodness sake!) who ditched her corporate job years ago to chase her entrepreneurial dreams. She gives some great advice about what it takes to make the jump, the biggest mistakes entrepreneurs make, and a bunch of other great advice. If you'd like, you can hear it at http://www.laresearchcouncil.com/?page_id=7. Hope it helps.