Hi Christina, sounds like you are very organised.
just re the drains - I had 2 drains after my mastectomy. One was in my side and this was taken out in hospital on day 4. The other drain was in the centre of my chest just below my breasts and I went home with this one. Really simple to change the drain bags. I was home with it for 5 days before it was removed at my first post op check up. I believe many of the ladies had their drain in at home for much longer than me. If you go home with the drain don't worry as it's easily managed. If/when the time comes we can give you lots of tips