its easy if your on 3.55, just update to 3.55 ofw and look for 3.55 kmeaw tutorial. once you got 3.55 kmeaw installed going from there to rogero 4.30cfw is pretty easy. the instructions for the rogero 4.30 cfw pup are included in the download.
Yea its easy you need to upgrade to OFW 3.55 however don't upgrade using the default upgrading system by Sony that is "Via The Internet" upgrade using a flash drive or USB stick. If you upgrade via internet you will get latest OFW 4.31 which wouldn't do you any good.