Last march I was walking along in ski boots, slipped and blew my ACL out completely and tore the medial meniscus, which really hurt.
Prior to that I had lived with a grade 2 partial tear in my ACL for about 8 years, the initial tear was from playing squash, I did not have surgery as my travel schedule would not allow it, but with a neoprene/metal knee brace I skied about 35 days a year for 4 years prior to the final tear.
The docs did surgery 6 weeks after the total tear, the delay was in order to let the swelling go down, fortunately the town where I live is the HQ for the US ski team and the local hospital has some very very good knee doctors.
Surgery was in and out in a day. They took a bit off the hamstring and wove that in as a replacement ACL. They also gave a nerve block that lasted a few days, if offered , take it.
I then spent a week lying on the sofa with my leg locked, the brace had a cooling pad installed which was great. I started a thread here asking for ways to pass the time when lying down, however the surgery made me pretty miserable and the pain killers basically put me to sleep for a week.
The 2nd week they took the brace off and adjusted it for some movement and got me up on crutches. So I would crutch around with the brace on, but when stationary take it off and keep the cooling pad on it.
I also started physio in week two. This was mostly trying to get the muscles to fire again, apparently the surgery knocks the nerves out of action and a lot of bending trying to get range of motion back. Did a few mile walks on crutches, a week of lying down is not good for the head.
Week three I had sufficient range to get on the stationary bike, and that was that for the next few months, physio for range of motion, building up muscle mass and getting the muscles firing properly. After two months I was allowed to run in a straight line, only on flat surfaces and bike on roads, nothing that would incur any chance of twisting. By October I was cleared for all skiing and mountain biking. Knee has been rock solid for 40 days of skiing and I now realize how wobbly my knee was with the partial tear.
Complications -
I developed gout in my big toe after a week, that actually kept me more awake than the surgery. It was effing painful. I also didn’t react well to the pain medication after a week (Percocet) so I got off that and with doctors approval nailed vast amounts of ibuprofen, which also helped with the gout.
The knew was also very swollen which needed a drain. The docs were not sure if it was related to the gout they checked for crystals but did not see anything. Anyway it has not reoccurred, possibly related to bad circulation in the toe due to lack of activity and swelling .
Advice -
Do whatever you can to build leg strength now prior to surgery. I sat on my ass feeling sorry for myself for 6 weeks (ok the torn meniscus didn’t help as that was the bit that hurt), that, combined with the week of the leg locked still led to a lot of muscle mass loss.
Watch the pain medications, get off them asap and onto ibuprofen or whatever suits you body. (my reaction was if I had a slight increase in pain, say banged my toe I would go into uncontrollable shivers for 5 minutes) .
As soon as you can start physio and really keep up on the home exercises for triggering the muscles and range of movement, then get on the stationary bike.
Move to a ski town to get the best doctors for knee repair 
good luck
PCM