When it comes to the question of whether or not the clarinet is hard to play, the answer is yes.
All musical instruments are difficult to play in their own way.
Each requires exacting attention to detail, innate musical sense, and a thorough understanding of the accompanying physical demands.
Is the Clarinet Hard to Play? Consistently practicing a proper embouchure, breathing, airflow, rhythm, articulation, and intonation, makes playing the clarinet easier over time.
Playing the clarinet is like playing the old game of patting your head while rotating your hand on your belly. The only real difference is that you have six heads, and you have to pat each head in a different way while still rubbing your gut.