How do you replace the headlamp unit on a vauxhall corsa 2003 model?

Starting under the wheel arch whichever side lamp you need to remove,unscrew nut from wheelarch strip and two bolts from edge of panelling.Raise wheelarch strip slightly and ease front panel off it's retaining pins.Unscrew fastener bolts from headlamp and front panel.Press and pull down the front panelling enough to remove the lamp assembly.Disconnect harness plugs for headlamp bulb,side and indicator bulbs and servo motor.Replace in reverse order.