It is DIY job,just drain coolant first,remove drain plug at buttom of radiator (blue color) remove uper & lower radiator hose,trans cooler lines,remove hold down clips pull out radiator,after install new radiator fill coolant from uper radiator hose & check trans fluid. have fun !
PS I'll go for new radiator.

------------------
MB STARS Master Guild Technician,12 years MB tech
6 years independent shop owner