Get it done Casper, I waited 15 years for the new knee replacement, actually I had the new knee replacement 1st March 2016, so it was its birthday today, so I took it in Rhino's Wetherspoon's on way back from hospital today to celebrate, bought it some Guinness.
Best thing I did getting it done, with the pain I was in before, common sense you will get some jip now & then, but minimal compared to before the replacement, other knee is getting ready, so I would go for another knee replacement 100% if needs be.
Sorry if I put you off it Casper, but believe me go for it.

