Hi Steph--
I have twins too, who are actually the same age as yours!
My first tip, really, which is an obvious one, I would imagine--is make sure there are two of you on hand. At the beginning, I can't imagine having only one person doing this. But you say "we" so I'm guessing you have a helper.
My second recommendation is make sure you're taking careful notes so you can really see what is going on. With two, it's even more confusing and harder to see schedules, etc.
Last thing to say--because there are two of them, and I'm assuming they're sharing a room, just accept it is going to take longer than it will with one baby. So be patient and hang in there.
After two TOUGH weeks, we made huge progress, so I hope you will too.