As an English speaker, the entire concept of tones is more than a little daunting.
On a lesser scale, the hardest thing about learning German, as, again, an English speaker, but one who had poor grammar instruction and no grounding in Latin, the idea of cases for verbs and pronouns was... weird.
On a lesser scale, the hardest thing about learning German, as, again, an English speaker, but one who had poor grammar instruction and no grounding in Latin, the idea of cases for verbs and pronouns was... weird.