BradG:
Dont sweat it. Stay calm. Just remember that the examiner holds your ticket in his or her hands. Be honest with him or her. Remember they want to see that you are up to the job. They want to see that you can handle any situation that comes up. They dont expect you to know everything. If you dont know, find out. Dont BS. I have signed off 11 CFI's in my life and they all passed at the local FSDO first time. That's luck. But I told them all to take there time and be professional.
Just remember:
The Airline Transport Pilot leaps tall buildings in a single bound, is more powerful than a 757, is faster than a speeding bullet, walks on water and gives policy to God.
The Multi-Engine Pilot leaps short building in a single bound, is more powerful than an RJ, is just as fast as a speeding bullet, walks on water if it is calm and talks to God.
The Instrument Pilot leaps short buildings with a running start and favorable wind conditions. He is nearly as powerful as a Learjet, almost as fast as a speeding bullet, walks on water of an indoor pool and talks to God if special request is approved.
The Private Pilot makes high marks on walls when trying to leap buildings, is run over by Piper Arrows, sometimes handles an airplane without inflicting self injury, can dog paddle and talks to animals.
The Soloed Student runs into buildings, recognizes a Cessna 172 2 out of 3 times, is issued a parachute, can stay afloat if properly instructed, and talks to water.
The CFI lifts buildings and walks under them, Kicks planes out of hangers, catches speeding bullets with his teeth and chews them, freezes water with a single glance. The CFI is GOD.
Author Unknown.
Good luck.