Not heaps hard, but they have a few stances, so you have to know what you can do and when, which isn't as simple as, say, Bob who has no stances and therefore all of your moves are available all of the time.
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He is not easy any more and suffers from the fact that he uses a form based art based on real fighting so his move generaly have a start up time where some one like Bob or lars don't. you have to always be aware of this and this can throw you off if you don't play any of these type of characters based on real fiighting. Also he is a stance characters with cancels for alot of his moves.