I recently painted the back room of my house in anticipation of the birth of our first child. Veronica was gracious enough to wait for me to finish decorating her room before she joined us in the outside world.
Most of the rooms in our house have crown molding, which I don't care for in a little girl's room, so I decided to try my hand at a painted stencil border.
This How-to should either give you enough information to proceed confidently or decide that this isn't for you. (I'm kidding, if you can paint a wall, you can add a stencil border)
Step 1: Sketch the room
Draw a rough sketch of the room on a piece of paper. You’ll use this to keep track of your measurements and calculations for each wall.