Moonlighting for a while is a great idea. Not only can you earn a large supplemental income, but also you can decide whether you really want to run an IT consulting firm full time. If you decide it's not for you, then you haven't lost anything.
Remember that not everything you do for your computer consulting company will be considered billable hours. You might work 10 hours a week, but you may only end up with 5 billable hours. Non-billable hours include marketing, business development, paperwork, organization, billing and collections, and accounting.
The best part about moonlighting is simply that you're not risking your family's financial future by quitting your full time job, and you have the time to make a well-educated decision on whether you really want to be a full-time computer consultant.
To learn more about making this choice, read the entire article (link above).
Blogged by Computer Consulting Kit