"They do your kicking and are effectively the rudder of your ship," he told BBC Sport. "We need to get that right like we did against New Zealand."
Stand-off Danny McGuire and scrum-half Sean Long teamed up to help the Lions crush New Zealand 46-14 in June.
They both scored a brace of tries at Knowsley Road, although the Tri-Nations champions were not at full strength.
"The halves did a great job for us, and if we can keep the halves on the pitch doing that we can match any of those teams because our forward pack is an equal of any of the other sides.
"We have had some decent halves in the past - Paul Deacon is a good player - but they never seemed to gel."
Deacon missed out on selection for the 25-man squad, with Leon Pryce, Richard Horne and Rob Burrow offering further half-back options alongside McGuire and Long.
Fielden should be fully recharged by the time Great Britain leave for Australia in mid-October, and he is relishing the trip.
"It should be good," said the Wigan prop. "We will get the chance to show the Aussies how good we are.
"I don't think they take you seriously until they see it with their own eyes or you do it against their team."
For the full story [click here].