Many moons ago I was in a steno school and can confirm that even a basic level of proficiency is a lot of work. It takes a lot of practice to get used to things like having the same letter on both sides of the keyboard (unmarked!), missing letters, umpteen rules for how to break up words and all the special patterns for common words and word endings. Often you have to press two keys with the same finger. I remember there was a concert pianist enrolled at the school that was on the fast track, but for normal people it's just plain difficult.