@MissPolly You'll need quite a bit of help. Ask at the hospital what is available. Perhaps you can get referral to have a breast care nurse come to check your dressings and help with self-care if necessary. They'll give you instructions about what NOT to do with your arm, and it's important to follow those. Don't push yourself to do too much. Gentle recovery is important. Anaesthetic stays in your system for some weeks and can affect your mental functioning, so that's another reason, as well as physical limitations, to not drive for up to about six weeks.
Accept offers of help from friends and the parents of your kids' school friends. Suggest specific things if they offer.
Take care. <3