I have removed the carpet headliner in my 272. The headliner was original. It was glued in with heavy, paste glue. It is hard to remove, but it is worth it, since the old headliner was foul and filthy.
You will need to remove hardware in many places, as it was installed after the headliner.
The underlying fiberglass has a combed, rough texture. We are applying foam-backed vinyl from Sail-rite. Unfortunately, the spray glue we were instructed to use will not hold it reliably. Some spots separate. Some don't. The combed surface doesn't allow enough surface adhesion for a low grip glue like spray glue. If you apply a headliner, use a spreadable glue that fills the gaps and is harder when dry.
The underlying fiberglass is so rough, contains combed grooves, etc, that we decided sanding and painting was not an option without some fairing first. We decided against applying fairing epoxy to the entire ceiling.
We are using some devices to hold the headliner to the ceiling: a couple overhead hand rails I have wanted to install, some trim, and some strip lights. We are still finishing the project, as it is either too cold to work on the boat, or it is warm enough to sail for all but two weeks at either end of the season around here. This season, we prepped two other boats before ours, so we didn't finish the headliner. What we have done is looking good. It makes the boat feel much cleaner than the greyish carpet headliner.
Thanks,
Andrew