Welcome aboard Jenny.
I’m assuming your ultimate goal is Machu Picchu. One of the Forum’s correspondents, Offroader, has an excellent Machu Picchu trip report which includes info on the LIM/CUZ route. You can post your questions to that thread and you’ll get a quick response.

Mig

http://nonrev.net/south-central-america/19286-trip-report-machu-picchu.html