Any Language ??
I think you'll find that anytime you go to a foreign country after studing it's language, real life is different! If you can listen to Japanese radio and TV and understand it, you will do well in Japan. In real life Japan, you will be dealing with local accents, different levels of politeness, male versus female Japanese, etc.
You will find that most Japanese people will be very appreacitive(sic) that you are learning their very difficult language and will have great respect for your efforts. Go to Japan and don't even worry about having a bad time!
My personal opinion !
Frank