probably too late now (did you get it done?? how did people react?) but still...
i'm getting mine done in 3 days - my flatmate knows and one friend knows. no one else. From what I read so far I expect the following: the swelling goes down so slowly that no one will notice you had your nose done. it's not that you leave work today and come back a week later with a tiny nose. the thing will be swollen for weeks and months and the swelling will go down with time - and no one will notice the change as they see you every day. so i wouldnt worry about that at all.
and if they ask why your nose seems swollen, just say you've taken up boxing classes