MJP is pretty well spot on.
Just make sure you know when you're enrollment ceremony is, and be back in time for it. Let the recruiters know where it is you're going and give them contact info "just in case" of course, but you should have no problems. After I got accepted I travelled to Alberta to work, and was back to Newfoundland in time to get enrolled and start school, and yeah, wasn't a big deal.
The only thing I can think of that *could* cause a problem is leaving the country to work, but, I don't see it being a problem. After all, until you enroll, you're still a civilian, and allowed to come and go as you please.