You copy the harddrive PES11 folder onto the USB, load up USBXTAFGUI program. Navigate to the PES folder. copy (or inject, its called) from Damyos files. Probably around 100 files (each individual logo is a new file), they are named well enough to know what they are. As he isn't making stadiums, this wont effect any of the stadiums you have made. Then take the USB stick and transfer it back onto the xbox (overwriting all files). If you assigned your stadiums to certain teams, you will likely need to do that again.
Thats the basics, I just messed around with it, and its pretty straight forward, or at least its alot easier then how it was done last year.