This thought passed through my head yesterday actually. Car restoration is like anything else in life. There are some things we can do on our own, like mow our lawn, that may be just as good or better than a professional. There are other things, like restoring a car that we may be able to do ok at with practice, but in theory would never approach the skill level of a really good professional. I guess it depends on the owner's skill level and what car he is working on. A high end car would only be wrecked by an amateur restoration. A cheaper car it doesn't matter and restoration may only make sense if the owner does most of his own work.