I'll go with Tin on this one. I can tell you that things went well for me both times. I went under without problem and woke up one second later and I was done. I was actually shocked, since it seemed immediate. Then I felt the lack of pain in the hip and was just severely pleased.
I had some pain, I ranked it about 0-1 on a scale of 10 (10 is the worst), both times. I was on morphine for a day or so, then off it and on tylenol for the duration. The first two days I was busy as all getup, since the PT and Occupational Therapist were on me consistently. I wanted it, since I was so psyched about moving without that hip blasting me.
The leg is like a log initially, and I had some incision tenderness, but really - did not compare to OA pain in the least. It gets uncomfortable when you sit for long times, but I moved around as much as possible. I was also trying my best to avoid the catheter (my own hangup, not any problem with it), so drank as much as possible and was urinating early.
That's really about it. It's not worth worrying about, each of us is different and has a different recovery, but you're in good hands and if your recovery is like mine and many other hippys, you'll be a fully mobile hippy machine in no time.