I am a cellist but not a very good one. I read tenor clef but not treble, and I don't know keys or how to transpose. I would like to learn to play piano, just for the purpose of playing the hymns on Sunday - we are a small church and can't afford musicians. I would know the hymns well in advance, so I wouldn't have to learn to sight-read. I am retired so have a lot of time - I would plan on about 30-60 minutes of practice a day. I have two questions. One, about how long might this take? and two, are the online teaching programs any good or do I have to have a teacher? Thanks.