That is an OEM harness, and hondas are among the easiest cars to install aftermarket electronics in.

Go to bestbuy/circuitcity/walmart and get the mounting kit - its about $20 and includes the pocket.

The wiring harness will be in the same are and will look like the reciprocal to that plug. The harness is another $20. You dont need an antenna adapter from what I see in those pics.

Once you have the harness, its basically matching up colors - use some kind of plastic crimp to bind the wires. You will regret using electrical tape by itself.

The mounting kit will clip into the housing, the radio will have an aluminum jacket that will have metal prongs that you bend into place on the inside of the kit and then slide the radio into the aluminum frame.

if it gives you shit bring me a 6 pack of mountain dew and I'll help/install it for you.