Hey Bobert, why not start counting backwards.

So, it's 482 steps from your front door to the nearest store, start walking while counting 482, 481, 480... and so on.

Do this enough times and your OCD will become normal and then slowly move to becoming CDO. If you're really lucky, you'll get confused halfway through and won't know whether your counting backwards or forwards. For example, count backwards until you get to, say, 110 - and then forget and start counting forwards again. You'll have walked 372 steps, leaving you 110 to count backwards. But when you count forwards, you'll end by counting up to 220 - and your step count from door to store will be totally fucked up.

Do this for several weeks until every count you know makes no sense whatsoever. Then play the banjo. Result.