modding a PSP Slim is really easy, you only need a Sony memory card(which you also need to store games), a knife, 2B pencil and a tiny bit of patience. So if you can save significant money on getting an unmodded PSP, get that instead.
he is talking abt hardmodding dude..
u hard mod the battery to convert it into pandora. But that shd be the last resort if u dont have access to a psp which already is running a CFW.
Sorry if I went off topic but as Spacescreamer said, you dont have to do this if you have a friend with modded PSP of any kind. So if you ever get an unmodded PSP and have no access to a modded PSP, here are some links