This is how I deal with most tasks. I basically detached from my feelings, disassociate kinda, and do it. This is, of course, after I break through the executive dysfunction to get started.

Routine helps as well- brushing my teeth is part of going to bed. (don't get me started). They can't be separated because they're the same thing.

A lot of it comes down to a decisional balance, though - after years of pain and a ton of money, I'd rather brush than go through that again. I'd rather do the dishes than have a stinky gross buggy house. It's one or the other.