Ya if it's the same as my 99 GV then the grill has to come off and there's some 10mm bolts and you pop the whole headlamp assembly off. It shouldn't mess up the headlight aim as long as nothing breaks and you don't touch the adjusters.
As to how exactly it pops out, I don't know, I haven't had to do it yet myself, but in the service manual that's how it's done. ...sorry...

There's quite a few cars like that nowadays actually. Some even have plastic "keys" you pull up and then presto, it's out.
James
PS: Tell him to work those 10mm bolts gently back and forth in case they're seized. No fun if they snap. Been there (not on mine, on customer cars.)