Natalie put a lot of work in to this (and we're suposed to be on holiday!). There's lots of great stuff in here - not just about the overall startup experience, but also advice on talking to press, raising money and building out the company.
I'm currently working on a single-founder startup. And, as with everything there are pros and cons.
So, in one word, Crazy, NO!!.. difficult, yes, but startups are hard anyway..
I'm a software engineer, as well as an MBA (finishing up) so I can do most of the stuff myself which I believe to be a plus.
When I was starting I found finding a co-founder to be a lot more work with nothing to show for, but since I believed in my idea I just decided to get started and do as much as I could.
I'm about to incorporate, am currently in a soft launch mode to get direct customer input and make fixes. I just divide my time between meeting people (customers etc.) and developing, and yes I have a day job (and a new born).
So, my hands are more than full.
Whether I'll be successful or not, I don't know, but the journey has been very rewarding so far.
Similar story here. Find a niche you care about. Look around for the right customers for your product. Do things manually as a test run if applicable. Make your first 10-20k or so. Scale out where needed.
Single founder startups usually can be great lifestyle companies until you decide to raise funding (if you do) as well.
If you're solving a problem you care about while making money at it at the same time, you basically have the ability to do whatever you want.
