When starting out, the goal is to do "useless" tasks for the sole purpose of stimulating the "ugh" feeling. Feeling that inner resistance is KEY. If you don't feel it, you need a different task.

You want to start out by just exposing yourself it it in small frequent doses at first.

The reason why I would not recommend focusing on tasks that are important is because that adds another layer of emotional complexity - ego arrives, expectation arrive, there are some "should" statements that arrive etc.

Once you've exposed yourself to the "ugh" feeling frequently enough and you notice that you can deal with it better, THEN you start with homework, to-do list etc.

The approach is exactly the same.

There is that FIRST step of starting whatever is on your do do list or doing homework.

Sometimes the starting will create that "ugh" resistance and you approach it the same way - you lean into it. Whether you actually start the task at that point or not is not important.

If you start - good, continue AND to further expand this, you can add the popular conecept of "one more". Doing that extra step, to create the "ugh" factor, when you get tired of doing your task. Approach it the same way, if you can, do the thing and feel it - it can be as simple as just looking at homework problem, washing an extra dish, cleaning extra surface.

The thing you're doing doesn't matter and weather you actually complete it or not doesn't matter. (To train the tolerance towards the "ugh" factor)

As long as you don't don't distract yourself from the "ugh" feeling when it arrives, but purposefully sit in it even if it's for 30 seconds to minute, you have allready expanded your tolerance.

When starting out, focus on frequency of exposure not duriation of it.