Just mist extra, you can put a plant in the shower and have the water bounce off the wall into a gentle mist on the plant, monitor your cham on there though. Don't pull or pick at the shed.
They will shed often just increase mistings to make it easier for them to shed. your cham is most likely going to get grumpy while its shedding so if your cham is acting funny dont be to worried. Also you might see it walking around a lot through your plants or whatever you have,its just trying to get the shedding done faster. Also it will puff up to help but dont be to worried your cham should be fine.