I would like to respectfully disagree.
In my opinion, dovetails, or any other joinery for that matter, all comes down to how well you can perform the fundamentals. Sawing to lines, layout of the joint, squareness of the stock. All these things contribute to the quality of your joint.
Sure there are guides and other techniques that can help, but no saw guide is going to help with a cupped board or poor layout.
I believe the best way to learn is repetition. The only way to do that is through practice.
A craftsman of your skill level, which I deeply respect, has these fundamentals mastered. Cutting a dovetail may not need to be practiced for someone of your caliber because you can repeatedly perform all the tasks accurately from your years of experience.
Aaron Franklin of Franklin BBQ in Austin Texas, the highest rated brisket in the country, said the only way to make good BBQ is by making bad BBQ first