A week before
Check that the door, cylinder, windows and shutters work properly. If anything rubs or sticks, ask for a check-up rather than waiting until the last minute.
Keys and trusted people
Only give copies to people who need them, without labels showing your address. Make it clear how to get in touch if something comes up.
When you leave
Lock every entrance, avoid public signs that you are away and do not hide keys in obvious places.
