Even amongst professionals there are often differing opinions about the "right way" to do one, or if they are even effective at all. I did one on my wife. She went into treatment. She relapsed. Many times.
But she also was introduced to AA and The 12 Steps. Years later she found recovery through AA and the 12 Steps. And I found recovery through Alanon.
It was worth every penny and I'd do it again.
Take what you want and leave the rest.
Cyranoak