Soaking him is the best action at the moment. If the shed comes off that is great if not personally I'd not cause him any more stress by trying to get it off your self, soak him for 20-30 min twice a day in 85-88ºF water (measure it) and do that for a few days. Work on getting the temps correct and humidity correct too. and let him be. 100ºf will not kill them but it will stress them out and also they may not be able to digest food at that temp (too hot or too cold effects digestion and other systems)

I help with lots of rescues and the first thing is reduce the stress and hydration. Which is why I'd wait on the shed, it will come off on its own if the hydration both from soaking and humidity are done you may need to help but wait until he gets a meal or two in him. Feed small give him a chance to get proper digestion going, a few light feedings then normal ones. The stuck shed unless it is all bunched up is not a big issue but stress is.

Good Luck! I hope this helps!!