"There is no particular mystery in animation.., it's really very simple, and like anything that is simple, it is about the hardest thing in the world to do."

If you replace "animation" with "UX design" in this quote from Bill Tytla, there is still some truth to the statement.

There is no "secret knowledge" regarding good UX design to be acquired from hidden sources - there is a multitude of books, websites etc. devoted to the topic. Yet, knowledge alone is not sufficient: talent, experience and perseverance are amongst the "other things" it takes to deliver great UX design.

Very much as with animations.