Surgery for ACL injuries is optional if you never plan on playing soccer, tennis, basketball, skiing, or any other sport that involves lateral/cutting movements. Otherwise your leg will keep giving out, you'll damage more and more of the internal structures, and you'll end up getting surgery down the line for a knee that's worse off than if you just did it now.
I just had my ACL surgery on Wednesday and it's not as bad as I thought it would be. Day2 and morning 3 were still rough, but I drove yesterday, don't use the crutches, have 0-95 degrees range of motion on my CPM machine, and can walk up and down the stairs. I'm stiff and swollen but the incisions are the only thing that really bothers me. Good luck in your decision.
B.S. in Sports and Health Sciences, Sports Medicine concentration
working on ACSM Personal Trainer certification