How do you wire a cigarette lighter in a corsa?

easy to be done like only takes 5 mins, check fuses for live in this case its the bottom fuse third one in as i have done so to mines, you cut the wire at the back and branch a live off to the lighter, then you wire the earth to anywere metal i used the metal behind the radio as its easy to get at and you use less wire,just remove radio unit and there sud be a place to screw into use that to connect the earth to it, connect live to centre pin on lighter and earth to outer pin and slide into hole, that's it not to hard like if your told is it???