I have a dovetail jig that I used for a couple years. When I learned
the skill of cutting dovetails by hand I no longer use the jig. I can
even cut dovetails on a skewed corner where most jigs can't even
touch. Two weeks of practice is all it takes. It takes awhile to
properly setup a dovetail jig and by that time I can be a long way
handcutting them, although a jig will be much faster if there are many
to cut.