[DividesByZero]

If you want to really do a start-up, quit your job. If you can't or won't quit your job, it is not yet time for you to do a start-up.

I quit my job with six months in savings to start my company. It took us almost 8 months to get somewhere - we filled the gap with just a little web design work on the side. I have never regretted leaving my job.

[anshumans]

+1 I was working in my cushy corporate job while my cofounder (also in the same company) and I tried to get our startup going on the side. Eventually I realized that I just didn't have the time to be successful at both and I had to make a choice. It's been over a year since I left and the learning experience alone was worth it. There is so much work and problems to deal with in building a successful startup that unless you're willing to devote yourself 100% to it, you're not ready for it.

[DividesByZero]

I would suggest it's not just a matter of willpower. You should be in a material position to execute effectively - having to start worrying about how you'll feed your family, or pay your rent is a massive distraction.

Build up a buffer so you won't have to worry about it, at least in the beginning.