I agree that Bermuda fits this climate better than Fescue, but thats what the customer wants. Norman would be tough, especially this year, but Im up in Northeast Oklahoma so it wouldnt as bad.
Most people this far south make the mistake of cutting the Fescue down to the same height as the Bermuda. But Ive got some lawns that are 100% Fescue, which I cut 3.5 long or longer, and the customers water well throughout the summer. As long as it gets plenty of water, full sun is better. But you have to over-seed every fall because this is transitional zone where Fescue survives but doesnt reproduce too well.
Soil prep, scalp, let it dry, heavy seeding, blow it in, then water like crazy seems the best way so far. Anyone else?