Tip: The headliner shipping bag might be useful as a "third hand" for installation.

1. Lay the shipping bag flat with the opening toward you.
2. Use scissors to cut both the top and bottom sides of the bag up the middle, until there is about 12 in (30 cm) left. The bag will look like a pair of pants.
3. Open the vehicle front/rear (as appropriate) doors, set the bag on the vehicle roof, and then bring the "legs" of the bag through each doorway into the cabin.
4. Tie the very ends of the legs together to make a very loose loop out of the cabin, over the roof, and back into the cabin. If the loop is too tight, cut a little more up the middle.
5. Use the loop to support the headliner during installation. If the loop is too loose, tie an additional knot to reduce slack.