You may have some assembly work to complete after purchasing a wooden picnic table set. Collect the necessary items; you may require a drill, a saw, a screwdriver, and some screws, bolts, and nuts. You can begin laying out the individual boards that will make up the bench. Place them in the desired position on a level surface, and then secure the battens to them using screws. Attach the legs to the outer battens and then turn them upside down to test their stability.