Replacing body side or quarter panels involves quite a bit more work, as most of the interior/boot trim will need to be removed, as well as rear windows and possibly rear screen. Check the glasswork section if needed. Fuel tanks or other mechanical items may need to be removed, depending on the particular vehicle. Sills and pillars must be checked for internal sound deadening, wiring or pipes. Before removing any of the old panel, make sure you have the new panel at hand. This way you can see exactly how much new panel you get, and also if any.