As mentioned above, I also break tricks down into sub-steps to learn them.
What has also been successful for me…
I organize my tricks into groups. When I’m practicing to make progress I rotate between the 3-4 tricks I’m trying to learn at that time. If I start to burn out a little I’ll throw 3-4 tricks I’ve recently learned (but still need to polish) then I’ll go back to the 3-4 I’m trying to learn at that time. For me it feels like an effective way to make progress without growing frustrated.
Also if you can pair up a difficult trick with a bind or quick-wind technique it helps.
Thanks to horizontal spins taking me several months to learn, I’m great at snap-starting a yoyo 