Hi Amanda,
seeing your 9 months post op i cant see this being a problem. I had a massage around the same time (i think, 2 years + post op) and it was a little uncomfortable. Think it took me nearly 18 months to fully get used to lying on my front with pressure on them.
Everyone is different so it maybe different for you.
Amanda & Joannabella, I’d possibly call the place you are going to see if they have a support pillow like what you have when you are pregnant, big pillow with holes for belly & boobs this will defiantly help.
Enjoy your massages ladies hope you feel great after them!