Can you get by without having a PCL surgery?

More often than not. Acl surgery is an effective and safe treatment for ACL injury. Often those results are transferred to PCL surgery. Not so. Pcl surgery is difficult, not reproducible, and often unsuccessful. Unless a patient has significant instability, rehabilitation, strength and activity modification are the treatments of choice.
Yes. Surgery is usually not necessary. The PCL prevents posterior translation of the shin bone (tibia) beneath the thigh bone (femur). Fortunately the back of the knee is highly reinforced with other structures that do the same thing, so a PCL tear is not as critical as an ACL tear. Occasionally surgery is necessary, but fortunately this type of injury can typically be treated with rehab alone.