In reply to SteveJC94:
I had ACL surgery, but with a cadaver tendon, nine years ago at age 68. I did PT religiously, and as soon as I could started short hikes at a local preserve. I chose a place with relatively short loop trails (~2 miles) so that I would never be far from quitting if things didn't feel right. The trails were hilly, which seemed helpful. I started using poles to mitigate stress and protect against missteps. My impression is that these walks contributed to recovery as much as the more targeted PT. After about 7 months I was ok leading easy trad, and was fully back at whatever I could do at that age (I think HVS-E1 in your system) in about a year.
That said, I think is might have been more like two years before I fully emerged from the mostly---perhaps entirely---psychological strain of worrying about the knee, and I suspect that subconscious favoring of it has lead, over nine years time, to the "good" knee being more problematic than the repaired knee.
You do need to be careful about early overdoing. I don't know if this is true of autografts, but the cadaver tendon actually weakens before it strengthens, and there is a period, about three months in if I remember correctly, when it is more fragile than the day it was installed. Meanwhile, you are feeling better and want to push just when you shouldn't. I'm told that if you mess up a graft, you are probably in for a lifetime of more trouble with the joint. In this regard, you'll be hearing from and perhaps meeting people who have pushed the envelope and returned to full activity much more quickly. I think it is worth understanding that they have chosen risks that, as with all such things, may have worked out just fine, but that doesn't mean you should strive to imitate them; the downside is not attractive.
I don't ski, and the rotational loads on the knee imposed by skiing are more severe than climbing and trail-running loads. I'd be very conservative about returning to skiing; there I think appropriate strength exercises would be critical, and a brace would be a good idea. (I wore an expensive custom brace for a short while; it was uncomfortable on the trails and more or less impossible on climbs and I soon gave up on it. I did use a stiffened mostly neoprene brace for a while but stopped that three years ago or so.)
Best of luck with the surgery. It seems reasonable to expect to be pretty fully back in the game in a year.