Nice to see someone's interested in PS2 VN's. I'd love to translate the Saikano game myself but I don't know how to hack it, either. I tried but failed miserably, although I really didn't know what I was doing. Anyway, I then tried my luck at contacting people and groups who have translated PS2 games in the past, but neither did I have any luck there, since, none of them responded. That should be your first option if you fail at hacking it yourself. Maybe you'll have better luck than me.
Also, what game is it you're wanting to translate? I'm very curious.