I just found this forum back, been a long time since I have been on here. I had my left hip replaced almost 14 years ago, what I did when I got the all clear for full weight and no aids, I used my reflection in a picture at the end of the hallway to watch myself walk. You can make changes to your walk to make it straight and no limp in a short time.
You will go through a reversal of opposite knee pain and back pain as your body aligns itself to the way it was before compensating for your bad hip, I had all the same worries! It gets better over time, don't overdo it, if you think you did take it easy for a day. One thing that helped me is squeeze your buttocks together for 10 seconds at a time a few times a day, helps get the muscles back in shape.