Don't know about the hardest to play, but I'd hate to lug one of these around, and I'd double hate to tune it!
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I used to work with my school's orchestra. Every Tuesday and Thursday the harp player needed assistance with her harp.. guess who was in charge of that? Yup! She had her own dolly, brought her own bench, and of course music. She would push the harp (I would not let anyone touch it either) and I would carry everything else. However, she did need help putting it in and out of the station wagon which she had lined with pillows. Definitely a pain to bring everywhere, especially if you have to deal with stairs...
Hardest instrument to play in my books.