DIY floral centerpieces??

For those who are doing this, how do you plan on making this work? Will you ask someone to bring the flowers over to the RH and have them set up the centerpieces themselves???
I am interested in doing this to save money, but have no idea how this could all work.

i was just thinking this last nite! i found a centerpiece in a mag that looks pretty easy to do..i was wondering who would actually set everything up if i brought everything to the hall