(1) I do ok. I've forgotten once or twice. (When, in college, I had a door that latched, several times I locked myself out, though.) Perhaps the thing is that I almost never do go outside without locking the door, so "go out, close door, lock door," has become a routine. Could that possibly help you?
(2) I like the singing idea, just anything to make you concentrate on it *should* help.
(3) A webcam sounds fine. It's good to be in control of your mind, but everyone has some idiosyncracy and one you can buy off with a cheap webcam is a good one to have :)
(4) If you're sure you do lock the door ok, but are trying to not worry, then you can try to attack that directly. Try to innoculate a "it's almost certainly ok, think about something else now" response to worrying about it, rather than trying to check?
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(1) I do ok. I've forgotten once or twice. (When, in college, I had a door that latched, several times I locked myself out, though.) Perhaps the thing is that I almost never do go outside without locking the door, so "go out, close door, lock door," has become a routine. Could that possibly help you?
(2) I like the singing idea, just anything to make you concentrate on it *should* help.
(3) A webcam sounds fine. It's good to be in control of your mind, but everyone has some idiosyncracy and one you can buy off with a cheap webcam is a good one to have :)
(4) If you're sure you do lock the door ok, but are trying to not worry, then you can try to attack that directly. Try to innoculate a "it's almost certainly ok, think about something else now" response to worrying about it, rather than trying to check?