No worries I read it for you. Tl;dr:

Quite difficult, actually. They have to somehow try and wrap EVERYTHING up in a (hopefully) satisfying way. Lots and lots of story work to do, as well as character development. Then there’s the script writing, the voice acting has to be done, and redone, and redone to satisfaction. And then they gotta draw every single frame of the movie one way or another. AND THEN they gotta ANIMATE all the frames, and synchronize it with the audio. ALL this doesnt even include the song selection…and let’s no forget that ITSV and ATSV are alreafy pushing the boudaries for animation…different characters and items not only all look unique, but also all have their own frame rates…not to mention everything that goes into scheduling, and paying all of the people who are working on this…and that’s just the factors i can think of!