"There will be a fantastic atmosphere at Goodison," he said. "Everyone knows it's a tough place to come, with 40,000 fans screaming away.
"But we're not worried about them, just us and I'm sure that will be enough on Wednesday. I hope so because it's every kid's dream to play at Wembley."
Everton could hardly be in better form. They are locked in a battle for fourth spot and still dreaming of UEFA Cup glory, aside from their Carling Cup heroics.
Johnson added: "There's a lot of strength in this squad now, with some top players on the bench.
"Every time we go out we believe we're going to win. We've been scoring from all angles, which takes pressure off the strikers, too. The likes of Tim Cahill, Leon Osman and Joleon Lescott have all got six or seven - and we're very strong defensively."