Its a pretty easy ob. Most radiators have 2 or 4 bolts holding them in and either a fan shroud ( for engine driven fans ) or an electric fan bolted on to them. Remove the upper and lower radiator...
Assuming since you own a Mercedes you won't be using old parts; Just the radiator itself without hoses and assembly, will run you anywhere from $190 on your lower cheap end and if you want a good...