Okay, no offense to Dennis White, but DO NOT do what he did.

If you value your car, you will take the time, spend the money and do it right.
Go to best buy or maybe walmart, they may have the kit. Get the Daewoo kit, use the dash kit and the harness.

NEVER cut the factory wires. NEVER do the hacksaw job on your dash. Get the proper equipment and do it right.

Here is why:
If you do a cut and splice job on your wiring, you give open access for the dealership to void the warranty on the electrical system of your car. Not to mention, cutting and splicing carried opportunity for catastrophic failure, and it just is not right.
Onthe dash, can you do it? Sure, if you have a steady hand, if you need to cut, but in the end, if there is an installation kit that will make sure it is right, with instructions an everything (dummy proof), why not use it?

Do it right, make it clean, it is just a better way to be...