Korg Forums

So, I wanted to learn how to tune pianos just to make some extra cash on the side. I don't know of any courses to take near where I live, but I found this on-line course you can pay for.

http://www.pianotuning-course.com/programs.html

My question is about certification - is it necessary to tune pianos professionally? I have an amazing ear, and know I could do this well with proper training. is there any additional information anyone can give me? Thanks for any help you can give me on this subject.