subwoofer install?

i need to take out my head unit to install the line in converter and connect the other wires. does anyone know how to take out the head unit without damaging anything?

-anton:banghead:

um what year is your car... i installed two 12's, amp and box, as well as replaced head unit and all four speakers in my 94 altima... if you have a 93-97, this may help: http://installdr.com/InstallDocs/Nissan/Altima.html