How to write in Japanese for Dummies?

I have searched through the discussions to find a solution to my situation, but it seems that my lack of code knowledge may be inhibiting progression/resolution.

Using 3.0.4 with the Suffusion theme, I would like to be able to type pages and posts in both English and Japanese. The Japanese always shows up as a procession of question marks.

I’ve read that I may need to delete two lines of code; that I need to change some numbers in the code; and that, it I don’t know what I’m doing, I shouldn’t *uck with the code. So far, I’ve taken the latter piece of advice as my guide, but I do wish to resolve this situation as soon as possible.

Is there anyone kind enough and knowledgeable enough to write up a short “How to write in Japanese in WordPress for Dummies”? I would really appreciate a walk-through (maybe even a crawl-through) the process.

Thanks