THe only time i have ever assisted in the shed, is ONLY when it has been past a few days and the shed will obvisouly not come off on its own.
while it is best to not even help ever, sometimes raising the humidity isn't enough.
there were two spots on my male panther he always had trouble with, the very tip of his tail, and around his ankle.
i noticed it would look tight, so gently i would try to help roll it off or kinda hold a spot that i could get and let him pull away taking the shed off.