I think it's pretty stable as the expander is left in for up to 9 months. The bone takes about 6 weeks to heal and I had to start expanding two days after surgery. The aim is that the expansion is finished before the bone has heeled.
I didn't get much in the way of nose bleeds. Breathing was fine, I was given oxygen to wear for first 24 hrs. Swelling was intense and it feels like I had a nose job because the cut they made in my gum is very high.
I have a very narrow nose, mouth breather, don't think any of that has changed since operation? Still very swollen so I can't clearly say ... On day 4.
Hope some of that helped, I'm pretty drugged up so sorry if I haven't answered everything