I just installed a Z120 into my 996 about 2 weeks ago. Your going to love it. Fairly simple install considering I was replacing a Dual Din Eclipse model which had been professionally installed so all I really had to do was snip the wires to my existing unit and wire it to the Pioneer harness. Easy enough right? Still took me 4 hours to install. Getting everything to fit, hiding wiring and securing everything always takes longer than you think, and I'm pretty particular about my car and how it looks so I took extra attention. Since you have instructions and a wiring harness you should be