I'm out of school now and I'll be teaching bass lessons for a little cash. I can play guitar fairly well (especially classical) so I can teach myself from there. But I find myself wishing I played piano and drums. I love the driving rhythm of drums and they help me drive a song and write a bass line. However, I love the polyphony and extended range of a piano. Whichever I choose, I would buy a beginner piece of equipment and take at least some introductory lessons.