I would think removing a radiator is pretty much self explanatory, even on a 140. I've done this R&R on a W124. You just take a flash light and snoop around.

On my '97 S320 the fan shroud comes out easily. Radiator is no doubt held in
with the usual U- clips. Drain the coolant. Disconnect the hoses and pull it out.

Worst thing that can happen is that you get stuck and have to post for help.
Best thing is that you easily get through it and can stand back and congratulate yourself.

Then you can do the write up.

Steve