chereb We are TKR buddies from 1st November. Following tips from everybody on this BS site, I haven't pushed my physio any more than has been bearable. At one point I couldn't even lift my leg an inch from the floor and my husband had to lift the leg into the bed for me during the night. Then I learned the knack of using the other foot to take some of the weight and realized that I could do similarly during elevation exercises which were always excruciating if I attempted them "cold".
Also, don't do your exercises unless you take your painkillers regularly as that will make the effort a lot worse and actually work against you with the attempt to do what you are capable of.
Just keep trying little by little. I'm STILL getting jabbing pains and dull aches in different areas, including the shin. Most of that is to do with using the leg "strangely" and so muscles, tendons, ligaments are screaming at you. Also, nerve endings take a long time to knit together and they give of pain signals in the process.
You'll be fine - I doubted I ever would, but PT at hospital tells me I'm doing well for 5 weeks. I was referred to my local hospital by the team where I had the surgery done (fortnight check up post-op), simply to keep me on the right track to gaining the ROM I need, which my PT tells me is 3 months, not 6 weeks as is sometimes mentioned. If that didn't happen for you, get your GP to refer you or contact the orthopaedic team where you had the surgery done and they will arrange it.
Remember, in the UK - if you don't ask you don't get!