It's pretty difficult to use your arms for the first week or two. After that you may notice that "Hey! I just moved my arms further back and it didn't even hurt!"
The first few days, in my experience, you can't reach back behind you for anything. Your world is all in front of you, not heavy, and small movements.
Iowa? Brrrr! I'm in far Northern California, we don't know cold here! My best guess would be things you can slip gently over your head, or easily pull on, or step into. But those first few weeks go by fast, and it's only a temporary situation. Thank goodness!! 🙂
Where is your surgery being performed? Is it close to home?