speaking from personal experience here's two tricks i've started implementing in my life that have helped me a lot. they mostly refer to cleaning, something i struggle severely with, but it applies to other stuff too
make the desired outcome easier and the undesired outcome harder
a big problem with doing a difficult task is that preparing for it is often impeded by various factors and the alternative is not only easier to achieve but will sometimes make the desired outcome even harder to achieve. so what you're going to want to do is make preemptive, permanent (so you don't have to do it over and over again, which could posit a problem in and of itself) changes to circumstances that both get in the way of the undesired course of action and also that eliminate obstacles to the desired course of action.
here's my personal example: I used to have a big problem with the organic trash in my kitchen, because as I used the kitchen I would want to put stuff down on a surface, which my kitchen doesn't have many (even less so bc, of course, I don't keep it tidy) so I would frequently put stuff on top of the trash lid. result the trash was very inaccessible and thus I would start accumulating trash in other surfaces and containers and also not take out the trash. solution. I removed the trash lid so I wouldn't have the option of putting stuff on top of it anymore and throwing trash in it is easier as well (it also solved a different problem wherein the trash would accumulate humidity which would get stuck and attract bugs which left a bunch of maggots that made me want to deal with the trash even less. taking out the lid meant the humidity didn't get trapped = no maggots)
2. limit the scope of your task as much as you possibly can. this is basically my version of the "break up a task in small parts" piece of advice people give except I always thought this was fucking terrible advice bc it only makes the task look even more gargantuan and unfeasible. the thing is that it's not a terrible idea if only you actually frame it the right way. what you actually want to do is pick one singular part of the task and ignore every other part of it as much as you can. don't list out every part it before you tackle it, instead you want to identify one singular, easily definable part of the task and then immediately tackle it without aiming to complete any other part of it.
this addresses two issues that I and a lot of other people have which is 1. the cognitive load of decision making on a moment to moment basis is mentally taxing and makes you burn out too quickly to finish anything. so if you can instead make one big sweeping decision once that you can just carry out without thinking instead of multiple small decisions every step of the way that'll make it way easier to do 2. the perception that its not worth starting something unless you can finish it. if you limit enough the scope of what "finishing" means, that becomes way more achievable. example: doing the dishes is really hard for me because I feel like it's not worth doing unless I do all the dishes, and when I start doing it I have to decide what I'll soap up next each time I've soaped up something. so instead I decide to just wash every plate, because it's more intuitive to pick up the next one without putting any thought into it, they're likely already in a pile anyway. if I'm done with that, I may decide that I could stand to do cutlery next, and then cups, etc etc. it also gives you convenient stop gaps so you can make a more active choice of when you stop doing the task instead of just kind of petering out and going "I'll finish it later I guess", kinda like chapters in a book
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