I know we have a few Audio specialists post up.
thewelshm
thewelshm
I have been out of car audio since about then.
It looks like it will fit. From what I also remember is that the dome light and keyless entry ran through the stock radio. I am not 100% on that though. That could have been earlier or later years I am thinking of.
Call around to some local car audio shops (not Best Buy). Just let them know the Year and Make of car, and tell them you need to have a "double din" radio installed.
It shouldn't cost that much to have it installed. I'm not sure of rates these days, but I thought the last I heard it was about $60 an hour. Shouldn't take more than one. You will need a kit, harness and I believe an antenna adapter. Maybe another $40-$60 in parts.
OR
If you want to tackle it yourself. DO get the wiring harness and Kit (Best Buy or Local shop). Do not crimp the wires. The harness make is so much easier and nicer.
Then look here
teek.info - My 2001 Honda Civic Car Stereo Removal
How to Install a 2001 Honda Civic Stereo | eHow.com
Wes is correct.... The dome light and keyless entry goes through the stock stereo. The "old way" of getting around that is leaving the stock headunit buried up in the dash with the corresponding wires still attached..... but, I think they make a little box that runs those function now. :dontknow: