"You always want to be dominant at home and protect home. You want to try to establish that," James told reporters after practice at the American Airlines Arena where the Heat will host Game Three of the best-of-seven series.
Miami, whose 28-5 home mark tied them with the San Antonio Spurs for best in the NBA's regular season, evened the series 1-1 with Thursday's road win in Oklahoma City, and both teams were trying to find the right frame of mind for Game Three.
The next three games will be played in Miami, and a home sweep would turn the Heat into NBA champions.
"When people come into the building they feel like they're at a disadvantage already before the game starts," three-time National Basketball Association (NBA) most valuable player James said.
Kevin Durant, who at age 23 has led the NBA in scoring average three times, reversed the psychology and said the Thunder relished the challenge of a big game on the road.
"I think the best thing about being on the road is you have to come together as a group even more," said Durant, who has averaged 34 points to 31 points for James in the first two games.
"Everybody in the stands is against you. The other team, of course, is against you, so it's kind of fun being like the villain on the road. We're looking forward to a tough Game Three. It should be fun."
Chris Bosh, showing signs of returning to full strength after missing nine playoff games with an abdominal strain, said the Heat were looking to press their advantage.
"There is pressure on both teams to win this game. We have a home court advantage now. We want to keep it that way," said Bosh, who had 16 points and 15 rebounds in Miami's Game Two win as he returned to the starting lineup.
Heat coach Erik Spoelstra was trying to see things from the Thunders' perspective.
"They've had two days probably to get beat up, and people to come up with whatever story line and motivation for them," said Spoelstra. "We have to handle our mentality and make sure it's aggressive and attacking tomorrow."
Oklahoma City suffered from poor starts in each of the first two games, overcoming a 13-point deficit in the first half to win Game One before losing 100-96 in Game Two after falling behind 18-2 in the first quarter.
"We got off to a bad start. That's obvious to everybody," said Thunder coach Scott Brooks. "There's a lot of things that we could have done better, and hopefully, Game Three we do better."
Spoelstra gave the Heat the day off on Friday to rest and get away from the playoff grind, but shifted gears on Saturday.
"Today starts the bunker mentality," he said. "We have to get our mindset right, very similar to what we had with the road warrior mentality in Game Two.
"Our mentality on the road, where we only had each other, we have to make sure that we create that here because nothing is guaranteed."
Bosh said he believed the home crowd would make a difference.
"The crowd is going to be loud, they're going to work in our favor and we're going to play the best game of all season tomorrow," he said.
"Just to be back in this atmosphere is great and we have a chance to really do something special with three in a row."