Even before publishing 20 Things Not to Do Before Starting A Business, I've been approached, nearly everyday, by someone anxious to start their own business, but who doesn't know if they're actually ready.  The following excerpt from The 4-Hour Work Week says it better than I can:

For all of the most important things, the timing always sucks.  Waiting for a good time to quit your job?  The stars will never align and the traffic lights of life will never all be green at the same time.  The universe doesn't conspire against you, but it doesn't go out of its way to line up all the pins either.  Conditions are never perfect.  "Someday" is a disease that will take your dreams to the grave with you.  Pro and con lists are just as bad.  If it's important to you and you want to do it "eventually," just do it and correct course along the way.

    Photo by kenchanayo.