In my experience, German was a piece of cake. Sure, it's a bit difficult at first, but pronunciation is easy once you figure it out and the grammar is not that hard.

Dutch, on the other hand... :)

I've been trying for five or six months now to pronounce 'Groningen' right, but I never succeeded. If there's one 'g' in a word, I can pronounce it. If there are two letters 'g' in one word, it's practically impossible for me.