I've never pplastered a thing in my life well maybe my thumb after some
spirited hammering.

I have a wall in the bathroom which is a little firther back than the
rest of the wall and though hmmm might be time to level it out... Now I
guess I have to plaster it right ? what kind of plaster do I need ...
just wondering if there is anything specific needed as its in a bathroom ?

Also once it has dried is plaster paintable or doe it need some kind of
coating ?

I shall google a bit about it. But advice welcomed from the pros of diy