[guilty]

That install looks pretty simple if you've ever used a rivet gun before.. You might even be able to find a handy member here to lend a hand installing it. That's not a very reassuring call-back from that shop though, definitely one of those "we really don't want to do this job for you, and if you insist on bringing it to us we'll do a really bad job of it" kind of deals. If you take it to a shop you might be better off paying more and taking it to a performance shop where they might take a little more pride in doing professional "show-quality" type work.