I had them placed under the muscle with the incision in the breast fold. Surgery was fine. Pain was definitely there afterwards, but easily managed with the medication prescribed. My best advice is to follow doctor's orders! Just do what your doctor tells you, and the healing process will be fine.
I'm now five weeks post-op and am very pleased with the outcome. The shape of my breast is just what I'd pictured, and I'm pleased with the size. I'm gradually getting back to my exercise routine and am feeling great!