PMR Dosages and Managing Symptoms

I've read through the discussions and note all the different dosages of prednisone, different lengths of time taking prednisone, plus the addition of other meds, for PMR. I also note that the tapering of dosages and time frames are so varied from person to person. It appears there is not a set standard among physicians. How does one know if they were/are receiving the right dosage? Obviously, if symptoms subside, the dose is working, but after tapering if the symptoms return, was the initial dosage correct? I've also read that a person shouldn't be on prednisone long term, but there are many who've been on it for a few years. Its all very confusing.