Will be praying for you for sure. The others gave good suggestions. I had a lumpectomy, but I couldn't lift my arms over my head for about a week.
Ask your surgeon about doing exercises. Very important, and I'm amazed at how many surgeons don't mention it.
If you want to avoid pain meds, I found that a bag of frozen peas (or any kind of dry bean) works wonders. Better than ice. I would use it over a thin washcloth several times a day. I kept several bags in the freezer.
Many HUGS. You will do fine.