Posted: 22/08/2015 at 22:55
Our experience was that there are good people out there who will help with garden design, landscaping, building walls and paths, etc, but we never really found anyone who understood plants and how to treat them. We have a great guy who comes in regularly now to help with lawns and cutting back overgrown stuff, but again, he's not a plantsman.
However, it's possible to find out most of what you need to know about garden management from books, forums like this, and simply trial and error. In time you will get to know your plants and get a feel for what matters to you in the garden, and how to get it as you want it. Soon, you will know it better than anyone else could.