I learned to play the guitar from a chord book but about two years ago I took the notion to play keyboard. Where do I start? I put my guitar on and strummed each chord note by note and found the corresponding note on the keyboard. Drew myself diagrams for each chord and learned chords on the piano. Since about 6 months I've started to learn scales on the piano in the same way. After playing mostly chords on my keyboard live I have started to learn all the fiddly wee bits that I know on the guitar on the keyboard. After about two years I like to think I'm a fairly accomplished keyboard player. It's actually not that difficult once you begin.