Mastering the art of Dogeza in Japan is very important and I recommend you that you stick it high up on your priority list if you are planning on coming over. "Dogeza" is when you get down on your knees to apologize - you would use this in situations like where you accidently drop your bosses cat out the window etc.
I heard that dogeza lessons can be a bit on the expensive side so I found the perfect video where you can learn how to do dogeza. Muha.
If you haven't done so, make sure you learn how to eat sushi at the same time too.