The Stockport-based player, and his fellow professional brother and caddie Scott, have done their homework on the famous links.
"We've been here every day since the weekend," said Jamie.
Paul Waring, a former English amateur champion who was in the same Cheshire squad as Howarth and Horsey, was less nervous than a year ago at Carnoustie.
He turned professional soon after and nearly a full season on the European Tour has prepared him well for this week's challenge.
Birchwood-attached Phil Archer also looked at ease with the big crowds in his first Open.
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