You can definitely install it yourself if you want. It takes time and patience though... it takes a while to get all the lines matching and all the gaps even. If it's your first time it could take as much as a full weekend to get everything lined up right. You probably want to get it painted before you install it. It shouldn't cost more than about $350 for a solid color paint job with clear coat and everything.
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Cruising a Z24 right now, But I've got plans....
http://www.lingenfelter.com/lpe%20-%208%20sec%20Vette.mov