removing/replacing radiator...

I was just in an accident Saturday night and it turns out my radiator is cracked.  It's a 1999.5 Audi A4 2.8 quattro manual.  I pick up my new radiator tomorrow but i was wondering what all needs to be taken off and how hard is it to do this.  I'm coming from working on mustangs and domestic cars and just don't know what to expect when I go to replace this.  Thanks guys

the car now has a check engine light on too it was a light front end collision where it only looks like the radiator was cracked.  Anybody have any ideas?