DD14 is giving up her band instrument when she starts HS due to the school's requirement that they be in marching band (not her thing). She is a moderately gifted musician (has always been first chair in a high-quality band without ever taking lessons, selected for county honor band). She has an electronic keyboard that she enjoys messing with and has taught herself various things by ear and by watching YouTube videos. I have NO idea if her technique is at all correct...probably not? Is this a big deal? Of course, she reads music already.

She is asking for piano lessons. Any tips for locating a piano teacher who will hold her interest as a bright, easily annoyed, independent teen who has self-taught a fair amount already? She is likely to be irked by starting from "the beginning." Also, any advice on buying a used piano??? I do have family members who play, somewhat well/seriously, but unfortunately they are not nearby.