I haven't even gone through this but the nurse's instructions do sound typical of just about any surgery. I'm with the other ladies though, ask your sister to come for support. You'd want to be there for her and sometimes we mamas/wifes get so 'independent' that we forget it's OK to need or want someone there simply because we're afraid of causing a slight inconvienence.
Anyway, like I said, I haven't had this procedure done but I did have a breast augmentation and was given instructions to bring a sports bra that clasps in the front. Champion makes a couple (you can find at sporting good stores or if you have a Hanes/Bally outlet nearby, they sell them as well). I bought one that zips in the front and hated it even though I bought it on the recommendation of another friend who loved it- ha! I think they suggest a sports bra for the extra support and the fact that they're not as uncomfortable to sleep in if you do have any swelling. The good news is you can always wear it in the future. I bought another Champion one with "extra support" that hooks in the back like a regular bra so I don't have to pull it over my head and I love it (I would just hook it in the front then turn it around when I was too sore to reach around). I wear it now whenever I run b/c the pull-over ones just don't seem to hold 'em close enough.
Wishing you the best outcome!