Please keep in mind - most of the people coming to visit this site are looking for help with adverse issues after a knee replacement, not reporting success. There are thousands and thousands of TKR success stories out there too, we just don't happen to see them on this site.
I would suggest taking a look at the results (and preparation) reported here:
https://connect.mayoclinic.org/discussion/tkr-2-lessons-i-am-learning/
Also, you can go to the Joint Replacement Group and post a new discussion, maybe titled like "Please share your TKR success stories" and tell people about yourself, your upcoming surgery and that you want tips and reports about successful TKR.
Just to let you know, I have not had TKR (yet) but had 4 total hip replacements and 1 revision. You would think I would be firmly in the "No way! Never Again!" camp regarding joint replacements after my experiences, but 10 years later I am still grateful I did it. I am mobile and my hips are pain free. I can do everything I want except downhill ski (my choice to quit as I am too daring & don't want to risk injury.) When the day arrives, I will have my knees replaced by the best surgeon and facility I can find.
Sue