So here it is, day one of working full-time on my business instead of cranking away at a day job. You know what my most profound observation is? It's pretty much like working any other day: I got some code written, made some phone calls, responded to a few emails, and made my product a little better.
The difference? It feels like it means something. My livelihood depends on me writing software WELL, rather than my salary depending on me writing software AT ALL. I'm not sure that feeling is directly related to being self-employed, I think that anybody working in a very small group (one of the first employees in a small business, for example) would be in the same situation: feeling like their actions have purpose and value. Regardless, it feels good. I think I'll keep it up.