I’ve had a total shoulder replacement (left shoulder) and I would advise you to do all your physiotherapy exercises religiously so that you are able to function without a sling as quickly as possible. I would also wear clothes that are easy to get into including yoga bras etc., that are comfortable and don’t dig into your shoulders. Keep your outer clothes simple too. Also, is you’re on your own, it might be a good idea to prepare and freeze some meals ahead of your surgery so that you only need to defrost/reheat once you’re back at home. A V-shaped pillow might be useful too along with other pillows so that you don’t roll on your shoulders. I hope the surgery goes well and you’re soon feeling a lot better.