I didn't realize the physical damage that could come of being poorly trained. For that reason alone, it is worth paying for a well-qualified teacher.

I found this organization online and will look into it.
OMTA

DS has consistently asked to learn violin, but I know he wants to play it as a fiddle, so who knows if he'd stick with it.

Thanks for the advice on the pianos. The school's music teacher has mentioned the piano there is junk. I'll need to find a good one for lessons. Perhaps someone at OMTA would know where to look.

Any more advice, anyone? DS seems to be able to listen to a song and with quick practice, play it by ear.