A few years back I had the opportunity to spend a lot of time in Iowa, just love it and still have many friends in the Makoqueta (sp?) area.
If you have not done so, loop up the certification requirements on the Federation of Fly Fishers web site and this may help in your decision.
Mark has correctly indicated some of the questions you need to deal with along the path to making your decision.
There is no doubt that taking instruction from a "certified" insructor will greatly help in your casting ability and that path may satisfy your need?
P.S. I have been "certified" by my wife for over 20 years but I still refuse to accept the official document for fear that it may incriminate me!
Pete AKA Frenchcreek from Calgary