I had this done when I was 14. My doctor said that if we waited until I were 18, the cartilage in my nose would be too hard and the surgery couldn't be done. I believe this isn't the thinking anymore, but my surgery was done back in the dark ages.
I don't remember any bleeding. I woke up from surgery with tampon-like things in my nose which were removed later that day, I think. At the time my surgery was done, the doctor said they liked people to be awake during the procedure so there would be less bleeding, but I was too nervous and they preferred for patients as nervous as I was to be out.
I remember that the person I shared a room with had had it done a few years earlier. She said she had black eyes afterward. I mentioned this to my doctor and he said "You don't have black eyes because I did a better job than her doctor."