man, u'll just open the psp and replace the lcd screen, that's nothing, no need of tech skills to do so. something different is installing the fucking Undiluted platinum (I thought it was ok but it requires huuuge precission and patience).
Obviously u'll void ur warranty but u're fucked up anyways.
my advice: take a shot. get tutorials and photos and u'll be grand. If u can't, then find a place for repairing it.
see the square coming out at the top of the screen? that's the connector. check where is it plugged and once done turn the psp on (without doing any kind of short circuit in the PCB, of course) without closing it fully, just in case it's not plugged properly.
I'd do it myself, looks like piece of cake!