If you are home alone and feel vulnerable, whenever you answer the door remember to LOCK, STOP, CHAIN, CHECK.
LOCK: secure all your other outer doors as the person at the door may intend to distract you while an accomplice gets in through a back door
STOP: think about whether you’re expecting anyone
CHAIN: put the door chain on or look through the window or spyhole to see who’s there
CHECK: ask for an identity card and examine it carefully – you can always tell the caller to come back another time when someone will be with you.