Self-teaching isn't so hard. My only formal typing education comes from a semester of middle school typing that I blatantly ignored so I could play with QBasic.
Once competency sets in, education becomes pointless. 120 wpm is impressive, but it'd be impressive from anyone.
Edit: WAIT A SECOND?! A bloody TYPEWRITER? Jeremy Christmas. Okay, I'm impressed. 120 wpm untaught on a keyboard is one thing, on a typewriter is a whole other ballpark.