My dad, Cecil May, Jr. began editing "Preacher Talk" during his days as president of Magnolia Bible College. He continues sending it out from the printing presses at Faulkner. It the March 2007 issue, he gaves some advice to public speakers that I remember him giving me early on in my own ministry. This advice has served me well.
"If you agree to do something, do it. Don't start by apologizing. If you feel inadequate - if you didn't get the time needed to prepare, if you are hoarse, if you are new at it - still just do it. If you are not really adequate, some will know it without your telling them, but many will think you did fine. Rejoice that you could fill a need spot." ("Preacher Talk; March 2007).