Removal Procedure

Remove the dome lamp. Refer to DOME LAMP REPLACEMENT (PICKUP) or DOME LAMP REPLACEMENT (UTILITY) in EXTERIOR LIGHTS article.
Remove the coat hooks. Refer to COAT HOOK REPLACEMENT (EXTENDED/CREW CAB PICKUP) , COAT HOOK REPLACEMENT (STANDARD CAB PICKUP) or COAT HOOK REPLACEMENT (UTILITY) .
Remove the passenger assist handle. Refer to ASSIST HANDLE REPLACEMENT .
Remove the sunshades and the retainers. Refer to SUNSHADE REPLACEMENT .
Remove the windshield garnish moldings. Refer to GARNISH MOLDING REPLACEMENT - WINDSHIELD PILLAR .
Pull the body side trim panels loose at the roof line.
Use the following steps in order to remove the headliner from the vehicle:
1. 7.1
  
  Grasp the headliner at the front.
2. 7.2
  
  Use a downward motion in order to disengage the hook and the loop fasteners at the rear.
3. 7.3
  
  Slide the headliner foreword, past the body side trim panels.
Fig 1: Locating Headliner Components (Pickup)
Courtesy of GENERAL MOTORS CORP.