If the first procedure doesn't allow room then follow the second one and remove the headlamp itself ok.
Headlamp Bulb Replacement (TrailBlazer) Removal Procedure
Caution: Halogen bulbs contain gas under pressure. Handling a bulb improperly could cause it to shatter into flying glass fragments. To help avoid personal injury:
Notice: Avoid touching the bulb or letting the bulb come in contact with anything damp. Oil from your skin or moisture on the bulb can cause the bulb to explode when the bulb is turned on. If either comes in contact with the bulb, clean the bulb with alcohol or a suitable degreaser and wipe the bulb dry.
after reading your instructions do I have to remove the grille or can I just pop the two round access covers off, if I have to remove the whole grille I will bring it in.