He is telling you what they do with a automatic, but they do have flush machines for the auto that exchange 100% of the fluid as compared to 4 or 5 qts when they change the fliter. A std as in your car has a drain plug on the bottom and a fill plug on the side , all you need to do is remove the fill and drain plugs, when it is all empty, reinstall the drain plug and fill up the
trans untill it is even with the treads on the fill plug, thats all there is to it, they take atf fluid by the way, I usually use synthetic