this is how to remove the radio.
http://handaaccessories.com/accord/accordcd.pdf


if you purchased the aftermarket harness, take that and color match wires to the aftermarket radio. Be sure to check that you're matching orange wire to orange wire ... orange wire w/ stripe to orange wire w/ stripe. Solder all connections and wrap with electrical tape.

If you don't know what you're doing, you can fry your radio and or damage your electrical system. This isn't something that I'd attempt if you're nervous.