JP are easy to play with. First then you do when you party with JP parties is let them know you are English by using auto translate. They will adjust and use auto translate as well. If you are DD pay attention to the tanks targeting. If you are tank make sure you are targeting the mob you want them to attack first. Switch targets as mobs die. JP players will sleep all mobs while focusing damage on mobs one at a time. If you are blm or whm sleep mobs that are not targeted. Also familiarize yourself with auto-translate.