It is a small bathroom and I didn't think I was up for a full room plank yet. So I decided on the back wall, or what looks like the back wall when you look into it.
(I apologize in advance for the yellow-y tone is some of these pics but this is a tricky room to photograph due to the placement of the window. I have to have the light on or the pics are super dark.)
I tried to get a closer pic of the "texture" below.
Back at home, I painted my planks (highly recommend this step) before putting them on the wall. I wanted a little contrast between the planks so I chose to keep the wall color as is instead of painting it white. I painted my planks with the generic Behr paint+primer white. I think it is a non-color but whatever. It is nice and bright. I used it on my board and batten in my entry way and liked it so I used the same on the planks. Once those are dry, I applied a caulk adhesive the backs like so...
Then I placed my first plank up at the ceiling and used my pneumatic nail gun to nail it on. (I started at the ceiling because I was going to just put my trim back on and figured if I messed up on the math and had to cut the plank the long way and use my jig saw, the trim would cover up the not perfectly straight cut I would have to do.) I did not try to find the studs at all (thank you for saving me that step, Allie). And thanks to the blogosphere, I found out about the nickel trick to space my planks. See below.
I caulked at the ceiling and where the board met each other and along the shower. I was almost done. But I wasn't digging how I messed up caulking the seams were the walls meet. Some of the caulk got stuck between the planks and it looked sloppy. So I decided to use a little piece of trim were the planks meet the walls to cover up any imperfections. You don't have to do this step but it was really bugging me so I had to.
Here is what I mean.
And here is the little piece of trim I used in the corners.
I still have to fill the holes and paint it but it cleans it up nicely.
I also placed this edging on the ends of the wall but the window and the toilet wall.