The defence will have to be at least as good as against Wigan, but I can't see it being a low-scoring game as Wire have plenty of points in them. The best way to pressure their attack is to get ahead on the scoreboard. Its relatively easy to put your planned moves on smoothly when you're ahead - a different kettle of fish if you're chasing the game.
The CC final and wire-Sts games both proved that Warrington are quite happy being level or even slighty behind at half time - Leeds' best chance will be to either get an early lead or stay with them until much later in the game (like the play off win last year).
My biggest doubt having watched the Wigan game again is where we can get enough points from. Sinfield controlled the game very well, but its hard to imagine McGuire alone giving us that much more potency in attack. We didn't look like scoring many points at any stage against Wigan.