Just to completely buck the trend, I had this after I knocked my nose 90 degrees sideways playing rugby. Had the op 10 days after doing it, thanks to the NHS. Went under general anaesthetic but I think the whole procedure took like 10 mins - the surgeon said she just snapped it back in.
Granted my nose was generally fine and the break was recent, but the septum deviation she described as "severe". I had swelling and painkillers for about a week, nothing too heavy, and after that the swelling went down and it was fine. Broken it twice since mind, so I'm pretty much back to where I started. Ah well.
I don't really see how much of a "train wreck" it could be up there unless you've deliberately taken a hammer to it - once they break it and reset it where it should be things should be pretty simple.