I think perhaps for the first time in history, one-man startups such as you describe are a real possibility without the need for much capital at all.

As long as you can develop your product/value proposition you can pretty much farm out the rest to other 'building blocks' out there.

You have ZenDesk for customer support, Highrise for CRM, Asana for project management, twitter bootstrap for websites and the list goes on. Most of the building blocks are free to acquire/use (until you reach noticeable traction).

All you have to do is build the core product for which you will have to learn the skills but it's a worthwhile investment.

Good luck!