Can't say very much if we don't know what piece it is. But in general, I'm not crazy about that word polishing. It implies that up till now you've just been learning the notes, and now you're going to make it sound musical. But you really should have been doing that from the beginning.
In particular, if you're only just now trying to figure out how to play notes softly, how have you been playing them? The technique for soft vs loud can be very different. If nothing else, I just think it's a more efficient use of time to start working on phrasing, dynamics, voicing, etc, at a very early stage in the learning process.