For me, 6/8 was a little bit too stiff and rough, so I set it to 8/8 and I think its perfect now. You dont need to remove anything to adjust the rear, not even the wheel. All you need is a floor jack with puck inserted and jack up car high enough, you'll see how easy it is once you start jacking it up.
I dont have any video of adjusting the rear but here is a picture. Just jack up the rear wheel high enough so the wheel is drooping down and you'll be able to access the black rubber buttons on the rear shock and reach inside with your fingers to adjust the knob. I removed the right side button. First turn it all the way to the right until it stops. Then turn it left the # of clicks you want to set it to.
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