If your bathroom reminiscent of an infamous shower scene from a 1970's horror flick, then you must learn how to paint a bathroom. We've all grown up in them; here is a quick and easy way to brighten your bathroom like a professional.
Lay out that plastic; you can never have too much! Use the painter’s tape to secure the plastic to the floor. Cover your mirrors and vanity as well. Next tape and edges of cabinets, toilet, shower, anything you don't want to get paint on. We're painting like pros, but still do not have the slight of hand to avoid any mistakes, so let the tape act as a guard.
Prime the entire bathroom, first around the edges with your brush, then the midsection of the walls with your roller. When you go into the bucket with your roller be sure to do a few rolls on the paint screen to avoid a drippy blotchy mess. Give it a few hours to dry; you'll only need one coat of primer. Once the primer is dry, sand the corners well and then run up and down the middle of all walls. This step is important to keep your paint looking even and not bumpy and tacky. If you're tired, which you just may be, relax eat lunch and finish later.
The paint is done with more or less the same process as the primer, but with one to two more coats, depending on the thickness of the paint you chose and your preference of how it looks after the second coat is complete. Use the brush along the edges, interestingly enough this is called "edging", and be liberal the further you make your edges the easier and more accurate you will become with the roller. Make sure the paint is dry and sand after each coat, and after the final coat so you have a smooth even surface. Coat until your heart is content, let it dry, then take a bath and enjoy your work!