Just lowered mine the other day to install a small backup camera LCD above the rear view mirror.
First you need to unbolt the handles on the A pillars.
Next unscrew your visor mounts and remove. The visor clips at the end of the visor are two piece that make a latch into the roof, pull them apart aprox. . 5".
Then pop the clear lenses that cover the reading light. There is a screw behind each lense that need to be removed.
The fornt of the headliner may come down after that, if not gently pull down on the front of the overhead consul as there are a couple push clips.