Last month Gerrard became the first Liverpool player to score a hat-trick in a Merseyside derby at Anfield since Fred Howe in 1935.
That result - and Tuesday's last-gasp win at Blackburn - will give the side a boost going in to Saturday' game.
"We've beaten Everton twice this year so that should give us belief and confidence but we need to perform to the same levels at Wembley to get the same result," Gerrard added on liverpoolfc.tv.
"We believe that we have the players in our squad capable of doing the job on the day but we all need to deliver good performances - all the players.
"To reach two major cup finals in the same season would be a fantastic achievement."