I have never taken piano lessons. I can read notes, not fast, but I can. I took tonal harmony course (just for fun) when I was at the university. I mean, I know the basics of harmony. Also, I can play fur elise and moonlight sonata mvt.1 for example.

So, if I start to take piano lessons, what contribution can the teacher make? Maybe I am holding my hands in the wrong position, so, the teacher can help me for that. And what else? Should I take piano lessons?

**Edit:** I answered my own question below, which may help those who are thinking of taking piano lessons.