The mirror replacement job will be different from car to car. Do you need only the GLASS itself replaced, or the entire assembly? If the former, there are services here on the Internet where you can order a glass-only part for almost every mirror made.
I have recently replaced a mirror each in our family Subaru and our Infiniti G20 sedan. Less than $25 each for the part. If you need to replace the whole assembly, it is often necessary to remove at least part of the interior door trim and undo electrical connections (such as power mirror or heated mirror controls).
The mechanical aspects of taking off and replacing the mirror are usually simple, once you have access to the three or four mounting bolts. Nt: cruise Ebay for a mirror assembly replacement if you have time. The differences in cost between Ebay offers and dealer prices are large.
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