if you have a spatial brain, you could think through it.
the three way corner miter had me really thinking through stuff. i haven't finished it yet, but just laying it out was a real challenge.
i was never taught these. i saw them on youtube and i'm just going through them. just watch every japanese woodworking video you can.
i've watched a million episodes of the woodwrights shop, and now i'm completely bored by them. which is a good thing. i get how he's going to approach everything. efficiency and all the gaps you don't see in the videos you can learn by experience. it's your best teacher. i'm going to keep making scrap joints until i get better.
use knives and marking guages and sharpen all of your tools. practice using a saw. my saw skills are definitely lacking and could use practice.
i could also buy a new saw. i use a crappy crosscut for even my long grain cuts.
practice practice practice, and critique your method always.