Attaaaaaaaaaack:

Photoshop with plugin for opening, editing and saving *.dds-files is necessary for working with the textures. If you can get your hands on this, the procedures involved for the actual work can be easily explained with some instructions and should not take too long to learn.

It would be simple stuff for a novice, and since you seem to have a good attitude and also some knowledge about japan, it would make you a great candidate for a team member.

Feel free to send me a PM if you have any questions or suggestions.