Let's say that you have done to a local nursery and collected a bunch of business cards. You are thinking of calling one or more of these professionals, but are unsure as to whom you should call. Well, the best trick is to google each person whom are you thinking of contacting. Even if it's a bunch of names you got from HOUZZ.
In essence, when you google any designer, you can see what they post on social media that will give you a realistic idea of what type of projects they design and if those design style fit with yours. It also allows you to get ideas for your own garden.
You can also grab my landscape design checklist kit giving you all the tools you need to hire the right designer here.