@Cynthia777: >>I notice the further I walk, the more stiffness I feel in the evening.<<
I did feel that way too. It was right at the start of the 3rd week when I thought I'd be brave and take pain meds every 12 hours, instead of 8. The first 12 hours were fine; the second 12 hours, about 9 hours into it, I got out of the recliner, and it was -- "OMG, this is not the time to stop pain meds". I was so sore in my operated hip. I did notice that every time after that when I got out of the chair, the less sore I felt, and by bed time around 11, most of the soreness was gone, only stiffness. I still took a Hydrocodone before bed - just so I could sleep through the night and guarantee the pain wouldn't interfere with sleep. The next day, I felt my normal morning stiffness, with most of the pain gone. But I backed off the walking.
Since you've still got a 2nd bad hip, your OS may not be having you do PT so early. I know mine stated he was more interested in having the bones / new hip solidify and muscles heal - with no extra stretching beyond what walking does. I did my heel slides, and butt clinches, ankle pumps daily, but that was about it. Towards the end, I used
@Squirrellymom's quad stretch exercises (which really helped with the sore incision area), but that was it.
My OS is looking at the recovery as a year long process, not something that gets done in 6 weeks. I know when I had a humerus bone fracture, PT told me it could take 8 months for the muscles to heal to the point of having arm strength and not noticing weakness. I think we all get impatient with recovery because our hip has stopped hurting, so we feel we should be 'cured' now. It's easy to forget that the months (or in my case, a couple of years) of gradual degeneration of the hip joint means it will take months (or more?) of getting back to moving correctly. In my case, it was using muscles the wrong way to walk (to compensate for immobility and pain), so I'm probably having to learn the right way to move again.