Regarding the mistakes section, the technical side of that is something I've also experienced. When you're working with smartphone derived hardware and platform

Regarding the mistakes section, the technical side of that is something I've also experienced. When you're working with smartphone derived hardware and platforms you get a pretty sophisticated platform that can do a lot, but it also takes a lot of effort to get everything working and stable. And you'll need to know how to use everything from linux build tools to an oscilloscope. And then 18 months to 2 years later, a new generation or hardware is out so you get to start again :-/. Very labor intensive.