A relieved Redknapp, who has never played or managed in a cup final, added: "It was a difficult game but it's a great day for the club. I am delighted for everybody."
Portsmouth goalkeeper David James felt they were always in control of the semi-final.
"I thought we dominated the game," he said. "But the way we did it was typical Portsmouth in the FA Cup.
"We were confident we were going to win the game and I think we controlled it.
"The lads are buzzing and the whole squad is here, even all the injured ones. That's what it means to everybody."
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