I was simply memorizing through Romans. I found it to be not only easier to work straight through a book, but also more beneficial; we're less prone to take things out of context if we memorize the context along with the popular 'one-liners.'
On a practical level, I would work through a section (for example, 2:1-5) in a couple days. Once I felt as if I was sufficient on that, I would move on to the next. I felt it important to work through the whole book at least once a week. I found the shower to be the best time, as there ain't much else to do! It starts to take awhile rather quickly.
Also, ditch the chapter/verse numbers. They only add confusion and difficulty in memorization. It wasn't written that way! You can always go back and mentally add verse numbers where you think it is important.