Student or Learner
Piano was my decision; practicing was my momís. At 12 years old, I wouldpractice piano for two hours a day, depending on how concessions were made. Mymom would sit next to me and work through what I had to do methodically while Itook the occasional long glance out of the window where my neighborhood friendswere throwing a football in the yard or running round doing something fun andexciting.
What does the underlined part mean?
If you work through something, you deal with it, resolve it, so she would guide him through whatever he needed to practise until he had mastered it or got to the end.