For English speaking users
This tutorial is filled with pictures so, I guess, it's quite easy to understand with google translation.
Anyway, I wish you good luck in your modding adventures!
Unfortinaly I cant find time to translate this tutorial. If you can do it, and interested in it, fell free to do so, just note me, as original author of this tutorial, and note all those other people, that I noted whose knolege,and help, helped me to do this tutorial.