Well let's see...first of all there is the problem of knowing how to do the stuff, and if you don't know then you can't do it. And if there is someone there who can do it better then you can learn from then because sometimes people are better teachers than manuals. And finally time savings of getting an experienced person to do it for you when you don't have a clue. I @ least speak for myself when I say that I wish I could do all these things by myself, but if problems come up and you need it fixed quickly a lower cost than you would get from the dealer, then why not enlist the help of someone else?