I was originally on 60mg of Prednisone for possible Giant Cell Arteritis. I found when I was weaning from 10 mg to 7.5 mg was when my pain started to return. However, I also found that the pain was due to the Prednisone withdrawal and NOT THE PMR. This was my weaning experience from 10 mg down to where I am now:

10 mg to 7.5 mg - a lot of pain - had to take 2 Advil - pain went away and never returned (speak to your doctor before taking Advil, may recommend Tylenol instead)
7.5 mg to 5 mg - severe pain - again took 2 Advil - same as above
5 mg to 4 mg - intermittent pain but eventually went away.
4 mg to 3 mg - Intermittent pain and some fatigue that did not go away
3 mg to 3 mg every other day and 2 in between - working out very well. Hardly notice any issues.