First you need to find an old-style windscreen wiper - if you don't have an old one lying around the garage, your neighbors probably will, and if not most garages will have a selection thrown away in their rubbish. Once you have found a windscreen wiper you need to check it for a sprung steel strip. This is located at the back of the wiper rubber (see photo), is very strong and is perfect for making tools. I always keep my old windscreen wipers until I have harvested the steel for this reason. You will find that it is the perfect width and thickness for slipping into the narrow gap between the trim and the instrument panel in your Mercedes, is very strong and it's also been nicely shaped to remove all the sharp edges so there is no danger of scratching your trim. Most wipers have this sprung steel strip, but not all, so keep looking. Once you have one, just unclip the blade to remove the steel.
Now you just need to cut and bend the steel to make your Mercedes instrument panel puller. The length of the shaft of the puller should not be less than 10 cm. The hook is simply a small sharp bend in the end. You may want to file your hook so that it neatly fits the grooves in your panel, but it is strong enough that this is not necessary. In all cases bend a handle into the end of your puller to give you the purchase you need to pull hard enough. Oh and remember to de-bur and smooth any cuts you make with sandpaper to prevent any chance of damage to your trim. That's it, have a look at the photo and make some, they take about 5 mins to make.
Before doing anything make sure you have the security code for your stereo - you'll need it as you'll be removing the battery shortly. Also it is important to turn the car on and centre the steering wheel to provide enough access to remove the instrument cluster from behind it. Make sure your windows and sunroof are closed - this is very important for re-syncing the electronics without any chance of an issue. Now, if you have an adjustable steering wheel, you should also lower and then pull it out to its fullest extent after releasing the locking lever (see photo). Finally turn all your electrics off ( e.g. stereo). That's it as far as preparation, just make sure the car is off and the keys are removed from the ignition and in your pocket (not in the car!) before proceeding to the next step. Never leave keys in a car when you are about to disconnect/reconnect the battery as sometimes it can trigger the central locking.
Anyway, to get access to the main car battery you need to remove the rear lower seat panel. There are clips under the seat panel on either side by the passenger doors - you need to press these clips up. The seat will now be free to be flipped up and slid out to reveal the battery in its base on the drivers side of the car. You may need to flip up some sound insulation to see the battery. Once the battery is exposed remove the negative cable by undoing the retaining bolt on the clasp and pulling the clasp from the battery. You only need to remove the negative cable from the battery (I was swapping out the battery at the same time so I removed both positive and negative cables).
Removal is a simple process of inserting and hooking the Mercedes instrument cluster pullers into the recesses in the console and pulling it out. You should insert them at either side of the instrument cluster where the trim strip is located (see photo), then slide them down to the corners of the console. This is where your DIY mercedes instrument cluster pullers really excel as they are thin and smooth enough to slide easily into position. The instrument cluster can be a very tight fit, so before pulling make sure the hooks are in the correct position and firmly seated in the hidden recesses at each corner (you should feel them engage and hold firm when you pull gently). You may need to alternately pull one side then the other to "wiggle" the instrument cluster out of the dashboard.
You will now need to remove 2 cables from the back of the cluster to fully remove it from the console/dashboard. These cables have a release "clip lock and rotate" retaining mechanism so do not just yank them out or you will break them. First the locking clip at the back of the cable plug needs to be depressed. Once depressed the rotating arm that holds the plug to the socket in the cluster needs to be rotated forwards. As you rotate the arm forwards the plug will withdraw itself (no pulling by you required) from the socket. Refitting the cables just requires placing the cable in position with light pressure and then rotating the locking arm back to the locked position which will automatically re-engage the plug in the socket. Both cables have unique plug pin layouts so you cannot fit the wrong plug to the wrong socket on reassembly. However, it is worth noting which cable goes to which socket at this point as it will aid swift reassembly. Once both cables are removed the whole instrument cluster can be removed from the car.