SHEDDING
Snakes shed on average once every 1-2 months. If a snake is injured physically, it will go into a shed cycle faster to repair the damage done. You can tell when your snake is going to shed from the dark and drab color of the scales and also from the bluish tint that comes over the snake's eyes. After the snake is in this stage, it should shed about 3-5 days afterward. If the conditions are good and there is enough furniture in the cage, your snake should have no problem shedding and should shed in one piece.
If your snake doesn't shed in one piece increase the amount of humidity either by misting the cage with a spray bottle or providing a larger water dish. If neither of those things work, try soaking the snake in lukewarm water for 30 minutes. That should loosen up any skin that hasn't come off.