The Reds hold the upper hand in their semi-final showdown with Manchester City, with Steven Gerrard's penalty at the Etihad Stadium handing them a narrow lead.
The road to Wembley will now head to Merseyside on January 25, with everything riding on the second leg of an evenly poised encounter.
Reina is confident Liverpool can get the job done, seeing them into their first major final in five years, and the Spanish shot-stopper has called on the Reds supporters to play their part.
"We are pleased, we are halfway through but we now have another hard job with the 90 minutes in the second leg," he told the club's official website.
"Anfield is going to be rocking and that is guaranteed for any second leg of a semi-final.
"Our fans will be massively important and they are always with us. I've no doubt they will be with us in the second leg and it will be one of those magical nights at Anfield.
"Hopefully they can help us get through to the final.
"We have got to finish the job now after doing the most difficult part which is winning away from home at City.
"We knew it was going to be tough but we felt if we could start with a high tempo and take the game to them we could cause them some problems.
"We started very well and could have scored before we got the penalty when Joe Hart made some great saves.
"I thought we handled them well in the second half because we know how much quality City have got, especially at home, but we got the result to keep us alive for the second leg.
"We now turn our attentions to an important league game against Stoke on Saturday and hopefully we can get back-to-back wins."