Hello! Welcome to the forum! You have been given some very sound and sage advice---and read those articles---they also have great information in them, too.
I agree with the others---I went back to the classroom at eight weeks after my BTKR, and i was much too early! While I could do things, I paid for it in spades, as they say---I was stiff and sore for quite sometime, and, looking back, I now realize that going back when I did lengthened my recovery process and time. I was stiff and sore by the end of the school day for about four months, and it was not until about five months that I lost a pesky little limp.
Many of us, myself included, did not realize the extent of the surgical trauma that the knee sustained during a TKR, and it takes time---lots of time---to recovery and let the knee lose its "anger."
Consider that you will be sliced open, sawed up (two bones!), pounded, and manhandled (they are not very gentle with this!), glued, and finally sewed back up. Some say it takes a year to return to normal---and I agree.
I will say, though, that after everything that I went through, I am amazed at how great I feel---and yo will feel the same way, too!
Pleae keep coming back and posting and let us know how things are, where yo live, etc.