If you're going to do an attack onto his house you gotta scare him out of the house into the street before shooting him. Preferably in however he sleeps. If you're on good terms with the people he lives with then i'd suggest using their help to scare him into the street.
Has to be while he's asleep, firecrackers work real nice. But however you get him out there you've got to be waiting outside with a powerful airsoft weapon to pop him with