Well the first question is what year car do you have?
For pre 98 read
THIS it tells you how to remove the whole headlight.
I linked to it so you can see where and how the bulb spins in and out.
You just spin out the old bulb and spin in the new one.
YOU DON'T NEED TO REMOVE THE HEADLIGHT HOUSING.
If you remove the headlight housing you will need to re-aim your headlights.
Most people like the silverstars or replacing the bulb in the low beams with a high beam bulb.
The high beam bulb has to be modified by filing the inside of the connector so it will fit on the low beam connector.
