The installation is pretty straight forward if you got a hacked/jailbroken(call it however you want)system.
Your system must have both nonpdrm and repatch plugins(google it)installed to work.
The modded files must go in ux0/repatch/PCSB00183/GAMELOGIC/ (The PCSB00183 may be different if you are from a different region and you should rename it accordingly e.g the US version is: PCSE00089)