Language barrier in Japan
Learning Japanese can be very challenging if wanting to go beyond the basics of conversation. Besides the difficulty of learning to read and write Japanese characters, there are very intricate systems of formal language, which even native Japanese speakers find complex and difficult to master.
In general, the Japanese are quite forgiving of language mistakes made by foreigners. However, it is advisable to be overly polite, humble and cautious, particularly within the context of business interactions.