Yeah head unit will take literally 5 minutes to pull out. The hardest part is getting the courage to pull apart you car pulling out everything else takes a little longer, but its super easy as once they're unscrewed you only have to disconnect electrical connectors. Its only when you want to remove the 12v plugs at the bottom that it gets a little messy.

AFAIK the glovebox is part of the dash, so you need to remove the dash to remove the glovebox, which is a 7hr job for a dealer apparently. I'm not certain thats the case, but its definitely harder than pulling out the head unit.

Cheers

Dan