I love that you are such a planner! You'll be glad! And you will be surprised how well you do,
I used a U-shaped travel pillow a lot for sleep, since sleeping on my back was not my preference.
Have someone nearby who is not squeamish to help out with drains that you may not be able to comfortably reach. And you can get gowns and robes with front pockets that help a lot.
I had lobular and insisted on a double, and so thankful that I did. Lobular has a higher incidence of occurring on both sides, and a small tumor was found on the other side. Best wishes!