American English Corrections

My Attempt at Writing

A have a daughter. Her name is Liza and she is seven. This year, she joined the  primary school or "she started elementary school" in American English. and music school simultaneously. For that reason, we  bought a piano several days ago. I have no words to describe her happiness, though I understand that we’ve been softly killing softly   our neighbors with exercises every day. "Everyday" means "ordinary". For instance, "You shouldn't wear an everyday outfit to a wedding."  :-)
The piano turner has  visited us today. He was an old man of about 60. However, he used a computer along with a hammer and a screwdriver to tune the piano. Or do you mean "instead of a hammer and a screwdriver"?  It took him four hours to complete his job and the old piano clinks beautifully again.

My Attempt at Writing

A have a daughter. Her name is Liza and she is seven. This year she’s joined the primary school and music school simultaneously. For that reason we’ve bought a piano several days ago. I have no words to describe her happiness, though I understand that we’ve been softly killing softly our neighbors by with exercises everyday. :-)
The Piano-turner has visited us today. There He was the an old man of about 60. However, he used a computer for tuning besides a hammer and screwdriver to tune. It took him four hours to do make his job and the old piano clinks again.