This is the kind of florist you can say "Hi, I know nothing about flowers but this is what I envision and this is what I have to spend. What can you do?", and she will miraculously build exactly what you were thinking, within your budget, and somehow come up with pieces of the floral arrangements you wouldn't think of yourself.
We were very hands off, not even giving specific flowers, and let me tell you-- our centerpieces, ceremony pieces, bouquet-- all of it-- was heavenly. I think we were able to do this in harmony, because my husband and I are not people who go into a professional's office and pretend we know as best as the professional. She knows flowers better than you do, so extend an olive branch and give her some room to be creative. So will not let you down!