One thing you can do to prevent further damage in the interim is to apply an encapsulating rust converter to stop additional rusting, and to firm up the already rusted areas.
Even if some portions of the panels will need to be replaced, minimizing the spread of rust may be beneficial. When it comes time to do the repair and refinishing work, removing all the trims, emblems, bright work, moldings, marker lamps, inner fenders, and anything else which is not part of the affected sheet metal should reduce the time and labor costs for the repairs.