Step 1. Remove the "Card Holder". Just use your fingertips and gently pull it away at the center. Try to bow either end towards the center. It will just pull out. Make sure that your hands are clean or you'll get your headliner dirty.

 Step 2. Insert the 2 small black clips that come with the grab handle into the square openings in the metal structure of the roof.

Before:

After:

 Step3. Place the 2 plastic blocks that come with the grab handle into the 2 openings. They are notched and snap into place.

 Step 4. Attach grab handle with the 2 Phillips head screws provided. You will have to slide the trim pieces toward the center of the grab handle to access the screws. Don't over-tighten!

Step 5. Slide the trim pieces back over the screws. They snap in place.

Picture of the grab handle assembly:

Part number (for Willow interior):