How do you replace the headliner in a 2006 Buick Lucerne?

To replace the headliner in a 2006 Buick Lucerne, start by removing the front and rear pillar covers, the sun visors, and any overhead console or trim pieces. Carefully detach the headliner board from the vehicle, taking care not to damage any wiring or clips. Replace the old fabric with new headliner material, using adhesive to secure it, and then reattach the headliner board back into the vehicle. Finally, reinstall all removed parts to complete the process.