You gotta be super careful you don't fuck up the ACL repair for 9 months, you can fuck it up just taking your shoe off using one foot behind the other, according to the stats I was given by the pt this happens to a lot of people recovering from ACL surgery
I ran into a random orthopedic surgeon on the chair last week ( good guy !) and he did a consult on the ride up, told me to do leg press/ hamstring (both directions) calf raises, you have to isolate the bad leg cuz otherwise you will compensate with the good leg
you might want to get a year membership at a gym cuz you are looking at a year or more likely 2 years of PT, a year at my local gym is 560$ but 3 times a week 52 weeks a year its works out pretty cheap per visit
if you can't afford a gym or its not convienient what you can do at home for leg press is load a bucket with heavy stuff hold on to the bucket while you do a knee bend, calf raises with toes on a piece of 2x4, for hamstring load up a bag with urgeryweight and do