I wanted to address this in a separate comment, especially given the prevalence in this thread of mentioning ADHD and its co-morbidities as further context for struggling with procrastination and 'motivation'.
It's important to be very aware about the ways to win and lose at what feels like the perpetual battle of trying to trick yourself into doing things, and for the crowd who can relate to this, I'd offer some caveats to what you said.
The operative point of "the smallest possible unit of that thing" is never, ever to systematically map out the entirety of a task and then select a small atomic subtask to do; that's just reaffirming your portrayal of something to yourself as insurmountable and monolithic.
Instead, choose the "smallest possible unit" that describes starting a task, and if the descriptions sound absurd then you're doing it right. For example, to a certain disposition, "do your laundry" or "do the dishes" basically invite avoidance, but "put your pair of teal socks into the hamper" or "turn on the faucet / wash one plate" is extremely easy to engage. What usually happens is you autopilot through a bunch of the task (it's OK if it's not all of it), and moreover you end up feeling great about yourself for doing more than you expected, which is strong positive reinforcement.
This is because you're not "shit at doing things"; you just need tricks to start doing things. And if the "smallest starting point descriptor" doesn't carry you through the entire task to completion, that's fine -- you can either parallelize a bunch of things this way and jump between them, and/or, your next "smallest starting point descriptor" is just the next step for that task anyway, so you can jump right back in.