you should clear your mind 1st thing.
try doing a physical activity if possible, get detached from the mental clutter you probably are having.
it is recommended to take breaks, and although counterintuitive,  is very beneficial for productive work.

than, i would suggest taking an iterative approach for the task breakdown process.
by iterative approach or MVP mindset, you can imagine the simplest core feature of your project - which tasks does it composed of?
* setting up infrastructure
* prepering your dataset
* basic training code
* etc

after you formalize these initial tasks, you get something to work on.
while working, you'll probably come up with more needed tasks, put them in your list and you've got a progressive work plan.
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