Help Installing a Pionner Premier CD Player in 2001 Eclipse GT

I just got a Pioneer Preimer DEH-680MP CD player and I have forgot how to put one in. I bought the wiring harness and have all the tools, I just need a quick run through. I forget if you have to cut the one end of the wiring harness and connect those wires to them ones coming out of the CD player. Any input would help. Thanks!!!

I just got a Pioneer Preimer DEH-680MP CD player and I have forgot how to put one in. I bought the wiring harness and have all the tools, I just need a quick run through. I forget if you have to cut the one end of the wiring harness and connect those wires to them ones coming out of the CD player. Any input would help. Thanks!!!
im surprized you didnt just buy the adapter harness. (Plug n Play)