I had my first, and probably only, hip replacement done at age 84. Do the exercises, do your PT, and, yes, have someone stay with you for the first week or two if you live alone, and have them stock your kitchen with very easy to prepare or microwave meals, plus your favorite ingredients for breakfasts, because it will be difficult the first week or two when you are on your own.
I had no problem with post-op pain. One glitch was that the doc prescribed a narcotic-acetaminophen mix, which meant I couldn't take enough of it to do any good because I'd bump up against the maximum dose of acetaminophen/day. I had to get that changed so I could take the meds separately, but that meant it had to be picked up at the pharmacy and I wasn't driving, not for about six weeks. So figure out how little things like this will be handled, i.e., who can run a errand for you? May it go well and may you be on the road to recovery soon!