I had mine actually fab and installed by Corsa, but def its able to be done at home if you have tools to do it. Or just take it like you said to local exhaust shop and have them install it.
I believe Autoanything has best deal and you get free shipping / no tax and if you call in the order, you get extra 15% off right now. I think that is pretty good deal.
http://www.autoanything.com/exhausts...0A2660482.aspx