I have a W123 with some rust around the front jack tubes that I'm going to have a welder repair. He asked me to remove the trim right above them so he doesn't scorch it. My Haynes manual makes only brief reference to body repair. Is there a source for figuring out how to do things (like remove trim) on my car?

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1982 240D automatic
Odometer quit at 307K...about 325K now