I did not DIY! Saw my tech do it:
lowered exhaust/supported, removed both axle halves, BIG MB air driven puller for wheel hubs, another smaller MB to press out bearing once hub is off. Had to use this tool two ways; one to pull 1/2 of bearing out then rearrange tool and then push out other 1/2 of bearing from back side of wheel carrier. Tight, had to really use force. Paid $500.00+ for both rear wheel bearing kits plus rear wheel alignment.
Not a job for the driveway and you need these special tools to do it right, plus expect stuck/seized parts.
The W124 rear wheel bearings are the hardest wheel bearing job of all the MB cars according to my tech.
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)