A bit of overkill on the dismantling department!
Really, the cluster can be removed without taking anything apart. As MTI stated, it's a pressure fit, not bolted on.
I have the special tools to do this operation ($15), worth buying because I have more than one MB, and it has other uses. But coat hangers will work as well.
Bend a small hook on the end of the hanger (you need two). Insert the hangers between the seam of the cluster and the dash (it's a tight fit) at about the 3 and 9 o'clock positions about an inch or so in.
As you pull out, the hangers should grip the serrated edges of the cluster, and pull sloowwwwly. Since you've already disconnected the cable, you can pull the cluster far enough out to gain access to the bulbs behind the gauges.
Your car probably accepts the 1.2 and 2W bulbs...1.2 watts for the warning and turn signal indicators, and 2W for the backlighting. They are the "twist-off" type and I can't find those anywhere but the dealer.
Expect to pay up to $6 apiece for them!