Wow, there's some really bad advice going around here... 
First, it is worth it to have someone else do it for under $20. Unless you're just itching for the experience, let someone else get their knuckles bloody and back twisted like a pretzel for you.
If you really want to do this, try pulling out your old stereo. (If the stereo doesn't come out easily, I really recommend you pay $20 for the install. I've installed into plenty of Hondas, and they're a pain in the butt if they're secured in the dash.)
You said the old stereo is "loose," so I imagine all you need to do is pull straight out. What do you see? Is there a nice plastic plug on the end of all the wires plugged into the stock stereo? If so, you're in luck. (DO NOT CUT THAT PLUG OFF!!!)
They make something called a wiring harness that works with that plug. Any circuit city, best buy, or car audio shop will sell them for around $10-30.
The stereo will come with it's own wiring harness that plugs into the stereo on one end and has wires sticking out the other end.
To install the head unit, all you need to do is connect wires on the harness you got at circuit city with the same colored wires on the harness that came with the head unit. Brown connects to brown. Brown/black connects to brown/black, green to green... it's not hard. Use wire nuts (or if you want to be fancy fancy solder them together and cover with electrical tape). Once you connect them together it you will have two plugs on either end of a bunch of spliced together wires.
The plug from the harness from circuit city plugs into the plastic plug that you disconnected from the stock head unit. The other end plugs into your new cd player. Next plug in the antenna (it's usually round and black) that was plugged into your old stereo. Turn on the ignition and turn on your radio. If it works, you're in luck. Celebrate.
Those are directions for the easiest possible head unit install. Frustration, time, and cost increase exponentially for more complicated jobs.
First, it is worth it to have someone else do it for under $20. Unless you're just itching for the experience, let someone else get their knuckles bloody and back twisted like a pretzel for you.
If you really want to do this, try pulling out your old stereo. (If the stereo doesn't come out easily, I really recommend you pay $20 for the install. I've installed into plenty of Hondas, and they're a pain in the butt if they're secured in the dash.)
You said the old stereo is "loose," so I imagine all you need to do is pull straight out. What do you see? Is there a nice plastic plug on the end of all the wires plugged into the stock stereo? If so, you're in luck. (DO NOT CUT THAT PLUG OFF!!!)
They make something called a wiring harness that works with that plug. Any circuit city, best buy, or car audio shop will sell them for around $10-30.
The stereo will come with it's own wiring harness that plugs into the stereo on one end and has wires sticking out the other end.
To install the head unit, all you need to do is connect wires on the harness you got at circuit city with the same colored wires on the harness that came with the head unit. Brown connects to brown. Brown/black connects to brown/black, green to green... it's not hard. Use wire nuts (or if you want to be fancy fancy solder them together and cover with electrical tape). Once you connect them together it you will have two plugs on either end of a bunch of spliced together wires.
The plug from the harness from circuit city plugs into the plastic plug that you disconnected from the stock head unit. The other end plugs into your new cd player. Next plug in the antenna (it's usually round and black) that was plugged into your old stereo. Turn on the ignition and turn on your radio. If it works, you're in luck. Celebrate.
Those are directions for the easiest possible head unit install. Frustration, time, and cost increase exponentially for more complicated jobs.
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