The bit about difficulty tipped the scales. If it's pretty easy, it'll give us some momentum, and we'll be all like "hey this is fun let's do another one."
Oh yeah, how are we doing it? Audio tapes. (well, mp3's, really.) At some point I'll have to get some reading/writing/speaking-with-other-people in, or my spelling will be tres mal. But it's a start, anyway, I'll let you know how it goes.