Stalker made a nice tutorial on how to position the front numbers.
viewtopic.php?f=67&t=426422 suggestions. 1) make a backup of the file you are editing. 2) take some notes. write down the hexidecimal numbers on a scratch piece of paper. convert the numbers to decimal if necessary (use the calculator included with Windows, set it to Scientific) unless you can think in Hex. add or subtract in decimal then convert to hexidecimal.
ex) 0012 h = 18 you want to move the number 10 pixels so add 18+10=20 convert 20 = 001C h
This way you can keep track of your progress because it is trial and error.
Make changes, save file, load game, select team and uniform, verify number position, repeat until you figure it out.