Get the extender leaf or leaves. Some farmhouse table designs include a storage area for the leaves beneath the table's top. Others require you to find your own spot for leaf safekeeping. If you have not used the leaf in a while, you may want to dust or even polish it before using.
Grip the end of the table and pull to separate at its center. If your table is made of a denser wood, such as oak, you may need an extra pair of hands for this step.
Add the leaf or leaves by positioning carefully in the table's open center space.
Ease the table back together by sliding each end inward to abut the leaf.