Clay,
you're going to have to be a lot more specific with the details of your install to get the right info.
lets start with the year & model accord.
you'll need a wiring schematic of your particular model...an adaptor harness is probably available but with many of the new model accords that have integrated hvac/radio controls it gets really iffy w/ aftermarket HU install's. I have plenty of access to wiring diagrams if you need it - i am a parts guy at a Honda dealership.
every install is a little different, so there is no one "DIY" guide to follow. Chances are though that this has been done...there is probably some info regarding this setup on honda-tech.com or a another similar honda specific forum.. google is your friend!
as far as the n2 bypass goes, it's on here ...take a look in the the n1/n2/n3 hacks/mods forums. its there (with pictures too!).
good luck