Is it a to-do list or a planner or a diary? I love her explanation, it combines realistic ("It's a damn notebook") with admiration ("I'm low-key obsessed") to make this sound easy, awesome, and worth it to try.
I have a whole notebook full of things and pictures that make me happy. When I'm feeling really low I pick a page at random and read it then I spend the day appreciating those things. Works every time.