I did mine this past weekend in my 01 GSR. I'm pretty mechanically inclined and used air tools on most of the job. I also had a friend of mine that is mechanically inclined help me. Total time for the job for us was about 6.5 hours with a couple of 30 minute breaks. We also used air tools to assist in the job. It's not hard to do, there are just alot of steps to take and double checking your work.
Dealer lists the time as 5 hours. Depending on the hourly rate of the dealer, expect to pay under $500 if you have all the parts. Also, if you bring the parts, the dealer will most likely not guarantee the install.