Since the headliner is molded and not fastened in the middle, you can usually just do as suggested and take some of the mounting stuff off. After you pull off the A-pillar, there's some clips on the sides, take off the dome light if you have an extended cab, and you should be good to go. I've fished wires through with coat hangers without doing any more than that.
With my first Ranger, I took the headliner out to mount something (antenna actuallly) on the roof. Once I saw how it was constructed I decided to not do that again since it wouldn't be necessary for most things (which led me to put my overhead console in without dropping it either). That Ranger was not an extened cab unit. Super cabs are even easier, I think.