i need to install my nos any one got any doupts

hey i was going to install my nos but im not sure if i should or not cause if i do it rong im fucked or even if i do it right and i messed up im fucked so if you can send me some sites on How To please reply or just show me some fat pics and also i got a tv in my car and is wondering if any one knows a program to hook up so that i can look at all my info coming out the ecu like all the codes and rember "LOUDER LOWER AND FASTER" i show mas love to people with rex's