Only assist if you see that he hasn't shed off for at least about four or five days. Sometimes they just take longer to shed off themselves, you want to give them enough time to sort it out and save them the stress.

Make sure your humidity is at least around 70% and that the snake has water available to soak if they want to and keep hydrated.

If you want, try to feed in-shed. Either they take it or they don't, it depends on the individual. If they don't take the food, wait until they're done shedding and then offer food again.