For the technical aspect, cf. also page 18-19 in the script of Polanski's Chinatown.
A character named "Young woman" is discontinued and replaced by "Evelyn", after introducing herself.
Personally, the best book I've read about storytelling was:
Card, Orson S. (2010). 'Characters & Viewpoint - Elements of Fiction Writing', Cincinatti: Writer's Digest.
I highly recommend it.
My way to do it would be to avoid repetition at all cost unless the repetition has something to itself (the fact that it's a repetition may let you focus on the little details that change). I think you always have to look for the action that will immediately suggest that something happened repeatedly (if a character had to learn some thing by repeating it, maybe his style of doing it once can already clue you in on how much effort he spent learning it). But this may be more the a point of view of a screenwriter than a director ...