I've been reading and watching everything I can find on the interwebs on this topic.

So with an aggregate of ideas, I'm leaning towards putting up a vapor barrier over the existing painted drywall and using 1/4" SC plywood for the walls. I always assumed vapor barrier just meant XX mils (6) of plastic sheeting, but there are a bunch of different products, materials, and "membranes" out there. There are limitless wood products to use on the walls and almost everyone of those has someone telling you not to. So I figure I'll just bite the bullet and pay for SC - hoping to source semi local, because shipping 4'x8' sheets of wood is costly.

I shared my thoughts on the project with my brother who used to flip/rent homes. He thinks I should pull the existing drywall out and put up a blue/green board product. Next, he prefers some paper-like vapor liner they use behind shower stalls (forget the name) and doesn't think I should nail/screw the panels (puncture the barrier), but rather glue them. Further, he expressed concerns about moisture getting trapped between the drywall and the vapor barrier.

On the other hand, I've read a lot of warnings about using any kind of adhesive due to off-gassing, odors, etc. While it will obviously be a "humid" environment, do any of you think a small finishing nail through a vapor barrier, into a wall stud would present any issues? Ok, it wouldn't be 1 hole, but more like 100 - lol. Also, I'm not going to lie - the thought of pulling all the drywall out (really not that hard, but messy) and then cutting, hanging, taping, and half-assed buttering (it's an art and I suck at it) is almost enough to make me want to back out.

At this point I"m paralyzed by indecision, so any thoughts are appreciated.