Assuming I know what I want the bouquets and centerpieces to look like, what is the benefit of having a florist? Is there any benefit besides having someone to do the work of sticking flowers in vases? And how much more does it cost to have a florist vs. just ordering flowers. I know what flowers I want where and I don't want to hire an expensive florist if the only service I'm getting is her sticking flowers in vases for me.