As these guys said, brake pads are pretty easy, no need to replace or remove rotors. Of course, when I went to do the brake pads on my 123, I discovered that three out of four pistons on the front calipers were seized, so I ended up replacing them and the rotors, and hoses, and packing the wheel bearings. Hopefully your car has a better history than mine, in which case changing the brake pads is as complicated as taking the wheel off.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)