Last year's beaten finalists will be looking to win the title for the first time when they take on Saracens in the showpiece at Twickenham later.
Wood, who has been named captain for this afternoon's match, told BBC Sport: "We've learned some serious lessons over the last few years. We've always had the determination but our direction has improved.
"Saracens have always got a plan. They're incredibly organised. We've found in the past that if you can disrupt that you stand a chance.
"Having [the Amlin Challenge Cup trophy] in the cabinet gives us that bit of momentum. It can work against you, because you don't want any complacency. But I think we can write that off with the team we've got."
Northampton lost to Leicester Tigers in last season's final.