Before you take the new bulb out of the packaging, grab a tissue or a clean rag. If the oils on your skin get on the glass bulb, it can burn out prematurely, in some cases the same day. If you must touch the glass, do so with the tissue. You shouldn't have to.
Holding the bulb's plug end, stick it into the back of the headlight. Be sure to visually confirm that it's all the way in. You can tell because it will be lined up evenly and none of the bulb's rubber gasket will be showing.
