I have given anesthesia for many total knee replacements, however, I dont see the patients once they leave the hospital, They go to the surgeon’s office for follow ups, so I cant tell you if that drive is achievable in 6-8 weeks. My biggest worry about it would be sitting in the same position for such a long time and forming blood clots in the legs that can break off and travel to the lungs, which then becomes a major problem. I dont know if 6-8 weeks post op is enough time, but I would definitely clear it with your surgeon before doing it.
Other advice I would give is to get a nerve block with an indwelling catheter. Without a catheter is a good alternative that will keep the pain at bay for about 1 day, but if they are skilled at doing the block with a catheter, they can hook up a pump with pain medicine in it that can keep giving youn pain medicine for several days. You wont require nearly as much narcotics with the nerve block.
Also PT. Do it as scheduled and dont slack on it if you want to regain the normal movement of the joint. As a fellow golfer, I know how important that will be to you later on.
Lastly, please, don't ever watch a YouTube video of your surgery again. It makes my job as an anesthesiologist much more difficult. The people that watch these videos come in extra nervous, with increased heart rates and blood pressure for me to deal with.