I've done several roof/wall/paneling repairs and replacements.... Not terribly difficult jobs once you know what materials and techniques work best, just time consuming. There is a order to how you would take things apart to make the repairs and replacement of siding, trim interior panels, etc easier. You will be surprised how poorly they are constructed once you start pulling them apart. As far as having someone do the work, it will be expensive and probably not worth it.. There is info on you tube and sites like this if you search, but every unit has it's own challenges..