Step 1: Sand All the Pieces

Rip 1x to size with a table saw.

Safety Alert: When using a table saw, make sure you use a push stick instead of your hand to push the wood through the blade.
Sand all the pieces with an orbital sander. Sanding removes the imperfections in the wood and provides a nice, clean surface for the stain.

Step 2: Stain the Sides of the Wood

Use a sponge brush to stain the sides of the wood that will be showing, making sure to go with the grain of the wood. Let it sit for a few minutes, then wipe off the excess with a clean, dry cloth. If the color is not as dark as you desire, apply another coat and again wipe off any excess.

Step 3: Cut the Pieces

Once the stain has dried, measure and mark for the correct length and then use a miter saw to cut the pieces on a 45-degree angle. To make the corner, flip the trim piece over and cut again. This provides the reverse 45-degree angle to match the other trim piece.

Step 4: Secure the Trim

Dry-fit the pieces and secure trim to the cabinet with a finish nailer. You don't want to nail the trim to the floor because it must remain floating in order to flex with the movement of the home.