Just remember, the graft is at its most fragile state from week 6 to 12, so take it easy on the exercises! I am just about 6 weeks into rehab, and the knee feels better everyday. My OS on Monday confirmed that the graft is exactly as it should be, and allowed me to start driving (which is nice!)
I still don't have full flexion (I am about 20cm short of my backside), but it gets a little bit better everyday. Doing a couple of rounds of squats, hamstring curls and calf raises everyday, as well as 2 physio sessions per week, which involve a lot massaging of scars, stretching, cycling and other exercises (this week concentrating on restoring proper walking gait). The walking is not yet perfect, but again, gets better every day. I am developing a bit of clicking in the knee this week, but hopefully that will pass. Pain is definitely all gone, and stiffness is much reduced, even compared to last week.
Also following your example on taking a day off from exercise here and there to let those muscles recover! Good luck with the rehab.