Good morning, inorder to replace the bulb...the headlamp assembly has to be removed first:
NOTE: Some moisture accumulation inside a vented headlamp unit is normal. Moisture will vent from tubes or vents located on the back of the unit. This normal condition will appear as a fogging on the inside of the headlamp lens (similar to the fog that sometimes appears on the inside of the windshield). This moisture may be removed by activating the headlamps on high beam for 15 minutes.
If water droplets larger than 1 mm in size have accumulated on the inside of the headlamp lens, the headlamp unit should be replaced.
NOTE: Once the crossmember is loose, take care not to scratch the fenders.
CAUTION: Do not touch the glass of halogen bulbs with fingers or other possibly oily surface, reduced bulb life will result.
The choice is yours....with it out allready...sure, replacing both bulbs would be a good choice instead of paying the same labor again to have the other bulb replaced if it ever went out.