I did the center one on my first (still owned) 124 and the rear on the second (still owned) 124. Number three has required no attention to the exhaust.

Mine were clamped together so perserverance was the key. Did not have to cut or break welds. That said, I hear some "puttering" from one of them and am considering crawling under there with my Oxy/Ac and fixing it properly.

You can do this at home. Save a couple hundred bucks, but it generally ain't fun.

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W108M117(1972) repaired after deer hit
W124M103(1987)
W124M103(1989) -- sold to son's friend
W124M119(1993) --
W124M103(1987 -- 5 speed Euro) - sold to forum member
W124M103(1989) -- TE
W123OM616(1977)
W201M103(1990) parts car