Installing the GR-2s on our Celis really isn't that difficult...I'd bet that you could do it yourself.

But if not, you could buy the GR-2s and bring them to a shop and let them install them for you...I can do it in just a couple hours for all four corners, so if a shop says it will take any longer than three hours, then go elsewhere.
But really, it's not difficult to do it yourself. The suspension-related how-to articles and all the threads on here will be of help, and if you've got any questions you know we're here to help. But whatever you do, don't pay $1300 for something that should cost $200.