It shouldn’t be difficult at all.
Go to your computer’s control panel,and install the Japanese language pack,then you can type in Japanese
using romaji phonetics,not needing to know the keys on a Japanese keyboard.
I wonder if anyone would recommend a different input method than the IME that came with Windows? Well, it served the basic functions, but I wonder if there are better input methods for Japanese out there that I don’t know of? Just as how the Windows IME for Chinese was too limited in its functions, many people such as I downloaded other software to type Chinese, so I thought it could be the case for Japanese, too.
Edit: Never mind, I’m trying out Google input and I’m liking it better.