Changing the camshaft sprocket is easy. Changing the lower sprocket requires pulling the timing cover, which is a lot more work. The vacuum pump, water pump, etc., all must come off, probably the radiator to make room. Then there's the crankshaft pulley/balancer and maybe the oil pan? Would need to check the FSM to be sure but definitely a medium to difficult DIY job. Rolling in a new chain would be simple in comparison. I will also make the statement (subject to correction from those with superior knowledge) that if the camshaft sprocket does not look worn, the lower sprocket is probably OK too. Finally, changing the timing chain before it's noticeably worn will help extend the life of the sprockets. "An ounce of prevention" and all that.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970