I learned from others all over the world. There isn't a thing that I can think of that can't be dowsed. The key is learning what you are, disciple, honesty, to learn how to ask questions for the best results. Every one will do it differently because of their life"s experiences. There are no wrong answers...just wrong questions. Much like any investigation. Again there is nothing you can't dowse. There are some things you should not dowse and that is up to you to determine. If you can't decide how to place a quilt piece or what color to use you can learn to dowse it.
Masseuses use it, some chiropractors use it. Nurses, etc. When I first started eons ago.. water was the venue, then as people became more familiar that other ways were more common and acceptable then it opened up to what it is now and growing. Many people take off with it with no regard to paying attention and treating it like a course not a play thing......not that you can't have fun.....There are doubters as there should be and those that like to control things that (can't) do it because they can't let go. It is really fascinating and can stimulate very interesting topics. A psychic is to same. You can do it with tools and without.