Final Fantasy Hacktics

So i've only just started sprite hacking today, and upon successfully replacing the Sprites for Cloud i wanted to add some more characters (Replacing Elmdor for Sephiroth and some of the random non used jobs into Vincent etc.) However on FFTEVGRP, Slot 10 (the black girl with pigtails) has no matching WLDface as slot 10 is Tetra. I've searched through guides on this site for a good 4 hours but i just don't get how i'm supposed to get around this and also add jobs/skills to the character once i do. Can any of you please tell or point me to a guide that will make this crystal clear? Also i have literally no hex editing skills is this going to be a major problem? Should i just quit while i'm behind? Any help given would be greatly appreciated, thanks.