Matt at Attitude Performance in Arlington Heights can do the install... Extreme Jeep in McHenry is a Jeep dealership that does custom work such as installs, but charge about $85/hr..
What kind of lift do you have to be installed? I'd really recommend installing it yourself, or with a couple fellow Jeepers. I had mine installed by someone else and now I regret it. Not because of the money, but becasue I wish I could have learned a thing or two about my Jeep's suspension.
My club, (link in sig) were going to get ttogether to install an OME 2.5" lift on one of our member's 4-door JK's next weekend, but something came up where he won't be available..
Maybe someone on here that lives a little closer to you can help you out, or if you would like to ask my club, join our site and ask in the technical portion, I'm sure the guy's with the right tools won't mind, just gotta speak up.
Good luck with whichever direction you go.
It's easier to go down a hill than up it but the view is much better at the top.
-Henry Ward Beecher
Current - '98 Black
Z28 with some goodies
Previous - '97 Gun Metal Blue
Northern Illinois Extreme Jeep Club