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These pictures are for the W209, specifically a 2008 CLK 350:
Turn your wheels all the way to the left. This is the forward part of the driver's side wheel well (USA)
Remove three 10mm bolts and one plastic rivet. Also remove a rivet under theside of the car just forward of the wheel well.
You will see this. The L-connector leads to the windshield. It comes off easily. Lift the pump straight up. It should lift out of the grommet with no problem. Unplug the wiring connector and reverse the procedure to install the new pump. You may need to replace the grommet so have on on hand.