I'm currently working through The Divine Office for Dodos. It's a step-by-step guide, where you basically just learn one thing at a time and build on it later. It starts out with having you look around through the breviary getting an idea of where everything is before having you go into any of the actual prayers. That book, however, recommends starting with Night Prayer (Compline), which is shorter and on a one-week cycle.
You might want to invest in The Divine Office for Dodos or a similar book.