Determine the number of pickets you'll need and cut them to length. Cut out your own design, or purchase pickets with a precut design (90-degree cut, dog-eared, etc.).
Lay out the pickets side by side and determine how wide the spaces between them should be. In the fence shown, the pickets cover the posts, so lay those pickets out first and determine the spacing accordingly. When not covering posts, the rule of thumb is to leave half a space next to the posts. Attach pickets to the stringers with galvanized screws and nails. To maintain a consistent space between the previously nailed picket and the picket to be nailed, use a spacer block.
After you attach all the pickets, apply paint or solid-color stain to protect the fence from weather.