TEACH MEEE :(
you're going to need 3 to 4 years of electrical engineering
http://youtube.com/watch?v=w6Pbyg_kcEk
You may have already seen this, but it's still fukken awesome.
I think to mess around with, say, a small electric piano, you don't need hardly any electrical engineering skills. Just google for a simple how-to, and with a few tools and some practice I'm sure you can manage. I looked into it after I first saw that video(months ago), and it seemed pretty easy.