The trimming of a tree is a really complex process that involves a number of different activities all of which need to be undertaken by professionals who have a certain amount of expertise in the matter. That said, you need to be able to ascertain what kind of results you want from them. A big part of the reason what that is the case has to do with the fact that there are quite a few ways in which your tree trimming can go, and a professional will need some kind of guidance that can enable them to give you what you are looking for in some way, shape or form at any given point in time.
The best way to figure out what kind of results you want from the person you have hired for dormancy tree trimming, Melbourne is to picture what you want the tree to look like. Once you do this, you can simply tell the arborist or tree trimmer what you had in mind and they can take things from there without requiring an unnecessary amount of input from you that would take up a lot of your time.
Most of the input that you give will be noted down, so try to be as detailed as you can be. You might want to dial back some of your ideas though, since there is a limit to how much a tree trimmer can do without the right kinds of tools. Try to discuss what you want with them in advance so that they can tell you what they think is practical and what you might be better off foregoing in the long run all in all.