Here's a breakdown:
* Dif - The "i" in "dif" has a schwa sound, which is like a very short, unstressed "uh" sound.
* fi - The "i" in "fi" has a long "i" sound.
* cult - The "u" in "cult" has a short "u" sound.
So, the word "difficult" sounds like: "dih-fi-kult".