These are the kind of jobs that most of the folks here have done at least once, so here is fine. Do you have a shop manual, CD manual or a Haynes manual. Any or all of these should give you an idea of the work required. Unfortunately I have only had to replace the belts on the 220D and that was many years ago, and quite a bit different.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150