I practiced on a car at PicNPull. Best two bucks for the know how.
If you go there pick up a few extra door panel clips just in case you break one.

You will need a small flat head screw driver to unseat the plastic covering in the door handle recess. Under the covering is a screw that will release the handle recess. Once the recess is released you will see a large screw that secures the top of the door armrest.
Remove the chrome plates attached to the door. One near the front of the door window and another near the door latch.
Remove two screws recessed at the base of the armrest.

The arm rest should lift free. Now, for me, it was best to remove the door panel with the window down. Remove the "puddle" light fixture from the bottom of the door. Just pull out and unplug. Remove three small chrome screws at the base of the door panel.
Use a large flat head screw driver slipped in between the door panel and the door itself to unlatch the clips. Should be one at each corner and I think one in the middle at the base of the door. Now just lift up/wiggle the panel free from the top of the door.

While you have the panel off clean the window tracks. Add a good silicone lube in the tracks. Sure speeds up the window travel.
Good luck

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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