side rant, lol*
The problem many times with asking local people for lessons is that they may not be effective teachers. Being a good player doesn't necessarily qualify you as a teacher. How can you tell? Walk up to them after service and ask what such and such chord or run was. If they respond with "oh, you just play this like this, then that, then...." RUN, lol.
end side rant*
Purrreach!!! You don't know how many times I have heard, "I want you to teach my grandbaby how to play the piano. How much you charge?"
My reply is always I don't give lessons because in all honesty I still need them. Then, I, depending on what area I'm in, refer them to a "teacher".
How many of them you think call? I haven't heard of one yet. Though they want me to teach them it would be a disservice to them if I would attempt to teach them what I know.
I have gotten some really nasty replys too.
But, I digress. Learning piano as in learning anything is about getting the information and then evolving it into your own style. You definitely, if you want to be really good, need to take formal lessons. Don't look so much for how well they play but rather how well they teach. Because once you have the information it's yours to keep and evolve.