Yeah, I caused myself a lot of misery by trying to follow the "eat the frog first" strategy, and get the big important stuff out the way before the easy / less critical things. Just led to me wasting days not doing the big thing, and all the little things were snowballing into much larger problems.
Now I go with "put the frog on your plate" - I tell myself honestly that the important task should be top of my list, and then proceed to avoid it by doing all the other shit. Sure, I have to deal with the problems of leaving something important til the last minute (and they are numerous) but at least everything else isn't also on fire.
It's not even upgrade, even twenty years ago, most of them were either always rinsing or on some sort of intermittent timer. I guess when they were just a big communal trench it didn't make sense for them to be flushed by an individual. (UK / various Europe)