Mark the depth of the joint by putting the ends of the wood at a 90 degree angle to each other. Use a pencil to mark the depth.
Use a try square and a marking knife to score the depth line all the way around the board. This will cut the surface fibers and make a clean cut easier to achieve.
Use a dovetail template and a pencil to mark the outline of the dovetails.
Place the wood in a vise and cut along the vertical lines with a dovetail or tenon saw.
Cut away the waste wood along the horizontal lines with a coping saw.
Correct any imperfections by placing the wood in a G clamp and using a chisel and mallet to cut away the excess.
Clamp the wood for the socket piece in a vise. Using the finished tail piece as a template, trace the shape of the pins onto the socket piece with a pencil.
Score the wood as you did for the tail piece, using a try square and marking knife.
Cut the vertical lines with a dovetail or tenon saw.
Cut away the waste wood with a coping saw.
Clean the cuts with a chisel and mallet if necessary.
Put the joint together without glue to test the accuracy of your cuts. Make any necessary adjustments with the chisel to get a snug fit.
Join the two pieces together with wood glue applied to the cut edges. Clamp it and allow the glue to dry.
Finish the joint by sanding off any excess glue that has squeezed out.