I hope you do realize you'll need to know some Japanese, mainly Katakana (which is easy to learn btw).
Also, basic phrases will help. You can't go around speaking English to everyone, for some get angry.
If you don't feel like doing this, then JP PSU is not for you.
If you are still interested, then what platform are you asking about? If its the PS2 JP, I would just recommend you passing on it, for ST is starting to cut its support for PS2. As for the PC version, I would just follow the guide on PSUpedia (
http://psupedia.info/Joining_the_Japanese_Server )
note: it might take a whole day downloading the files, and a couple hours to make an account and set it up properly. Just be patient.
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