My wife has done hers, but she has quite strong legs, and with various exercises and general caution, she is fine, but understands she won't ski again, unless she has an operation. She never has any knee buckling either. (Doc's are fairly sure it is ACL, snapped, from MRI)
But listen to docs, scans, etc, and I would be steering towards the operation... so I could surf freely, etc....
PS - the "other" ligaments aren't usually much, and generally will either repair themselves, or they put a little stitch in them whilst they do the ACL.
If the ACL is intact, the little key-hole operation for an "internal knee tidy up" (nip & tuck) is also a very good option for anyone with general knee soreness. Quick recovery usually. Short Term Pain for Long Term Gain !!
Regards "Doc" Simon

(I'm not a doc!)