I was not a app developer before, but a systems engineer with devops experience. But I learnt a lot about apple development, app store connect and essential became a app developer in a month. I don't think I can learn so quickly with other humans help.
You might be surprised. In 2008, when the App Store first came out, I became an iPhone app developer after reading one book. I already knew C, so Objective C wasn't a big leap.
Between my own apps and consulting work, I had a pretty good side business. Like everything else though, those days didn't last forever. But there was a lot of easy money early on.
