With Stuart we let him loose in the house, and where ever he went to the toilet we put down a litter tray. They tend to go in about 5 or 6 different locations. After a month we started to remove the trays one by one, and he soon got the idea untill we ended up with only one tray. After a while he didn't even use that one, prefering to go in his cage.
Initialy he did chew the wall a bit, but we started to put out old toilet rolls for him and he'd chew those instead. When he went out in the garden it was either in a run that we had made for him, or on a lead. He's now burried near the cherry tree that he liked to sit under. Unfortunatly he had a mysterious fit one day and died in my wife's arms.