Install the armrests
Cut the armrests to length and round their front corners with a jigsaw.
Use a router equipped with a 3⁄8-inch roundover bit to round the edges, then sand any rough edges. Attach the armrests to the tops of the legs with 3-inch screws, aligning the inside edges of the armrests with the inside faces of the front legs.
More: where to start and what you'll need