Oh, "How to Win Friends..." is eighty years old. That's the part I have the biggest problem (being on the near end of the autism spectrum). But even I managed to find a small client with a long-running project that I kept busy with for almost eight years until I needed a change. The point I regret a lot is not having sought and become part of a small team to handle to long-running projects better in every aspect. The folks around me I admire the most did just that, most of them working in a two-people team and they are very productive and inspiring..

Regarding the 20hrs/week, everybody should know: That's the productive time, for every human being. Charge accordingly.