I was able to take a shower the day after my surgery. My doctor uses a waterproof bandage that stays on for 7 days, then you can take it off and shower without a bandage. I am sure your doctor will give you directions in regards to this, because I'm sure it depends on how your incision is closed and the kind of bandage he uses.
I never used a walker, just crutches and a cane. I used two crutches for a few days, then one crutch for a few more. After that, I used a cane for about another week or so for walks outside, and nothing around the house. The physical therapists taught us how to walk up and down stairs at the hospital the day after the surgery. (If this sounds a lot like what Curt told you, it's because we had the same doctor and hospital
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I have no stairs at my house but I think it would have felt like a lot of work to go up and down a set of stairs several times a day for the first week or so after surgery. However, once I got out of bed in the morning, I did not get back in until bed time. I used my recliner and couch for resting and napping. So I don't think going up and down just once per day would have been a big deal.
Good luck with your surgery!
Annie