Even with upped humidity, if there is scabbing, be ready to jump in and help out as it's entirely possible large pieces will just get stuck. Also expect some blood. I helped supervise a rescue my parents did last year of a wild ratsnake that got caught in netting (looked like about a third of his skin had been pushed down like a sock) and he went through several emergency sheds before he could get through one without help. Always re-opened the wounds and freaked my parents out a little.
As for upping the humidity, I'd stick with methods that involve paper towels and not moss. Wouldn't want any debris to get into wounds that might re-open.