I'm just about finished setting up my two aways for next year, and it was pretty easy. I've found that even if you have not mailed in the appl. yet, the program may save you a spot if you call, sound really enthusiastic and ask (nicely, of course.)
Also, from talking to some residents, the away rotations may not be as crucial as a lot of people make them out to be. This, of course, depends on how competitive the programs are that you're looking at. But a ton (if not the majority) of people get interviews, and even match at programs where they never rotated.
Good luck!
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