I had a hip replacement 3 years ago. I was warned that one leg sometimes turns out to be slightly longer than the other, but I haven't noticed any difference.
The first few post-op days were very painful. Getting in and out of bed and getting myself to the loo was agony, and I found myself, like a junkie, longing for my next fix of morphone. I dreaded being discharged.
The first week or two at home was painful. Not so much the walking around, which I coped with quite well with the aid of a wheeled walker, but the lifting of my leg to get into bed. I was told to sleep on my back for 6 weeks, and it was too painful to do otherwise, but after a month I found myself waking on my side, quite comfortably. Putting on shoes and socks was quite a challenge, for some time, but gradually improved.
I pushed my little trolley around the house, and made small trips outside, and gradually built up my strength. After a few months I felt much fitter, and confident enough to drive again. All my pain was gone, and what I suffered for a while, after the op, was nothing compared to the pre-op pain I had had for a year before.
Good luck to everyone undergoing a joint replacement, or recovering from one. It's no picnic, but a few weeks of pain is infinitely worth the benefits you get afterwards. I'm almost 83, and can happily walk 5 miles without any hip pain. Pure bliss!