It's not, really truly, especially since most of it's already documented on wiiubrew. Myself and most others I know are self taught, you don't need any special fancy schooling, just time. People just want it NNNNOOOOOWWWWWW *whine*. Before 2015 I knew zero about PowerPC, ARM, making an exploit, or about any of the file formats I and others have wrote converters for. You can start learning right now if you want, but most people are too impatient and wait for results. You just need lots and lots of examples, and if you know where to look there are more than enough.