Pioneer AVIC Z3 DVD

Good Evening

Lately I've been lurking these forums as a guest but today I finally decided to . Anyways I just hooked up a brand new navigation/DVD unit for my car (Pioneer Avic Z3) I'm so happy :) I installed the unit by myself and everything looks good. The only thing I don't like about it is that your not alllowed view movies while in-motion (not for me but for passengers) and input navigation details while driving. I found a website that has a [url=http://www.underground-secret.com/]Pioneer AVIC Z3 Hack Guide[/url] how to bypass guide instructions.

I was just wondering...How safe is it ordering from the internet? I have never purchased anything from the internet before, sorry for the lame question. :)