Not sure if any of you guys actually installed your own head unit. But in my 97 gsr it was hard. First take off the shifter plastic and armrest as stated before. Look all the way in the back there are 2 screws that are tucked away in the back that holds the deck in place. They were hard to get too but after some gushing blood it came out. There might be another way to get it out however. There is a site that I found a while back that showed step by step. I typed in integra audio or something at www.google.com. I would give you the eact site however I am work and I only have permission to be on HONDA ACURA.net.
Also on the harness like mentioned before it is a good idea to buy a harness from, like walmart or discount auto for about 9 dollars. it should hook right up to your orginial harness. On the new harness blue= remote orange= mem red= constant power. If you hook up the right colors and the stations keep erasing then swap orange with red. I have had this problem with a few imports.
As for the dash kits. I have yet to buy one of them for a honda. If it is the same size as the stock tape deck it should fit fine. Use the 2 hooks that is on the pocket and attatch it to the deck. then just cramit it in there hoping that you pulled out the tabs on the metal basket that holds the deck in place.