"We're a team that's never shook," Chalmers said.
The now-veteran Heat point guard said he expected a similar style as Game 1, but that the execution level would be higher.
"I think both teams are going to be more precise," he said. "We've got the feel for each other now. Game 1 is out of the way, so it's going to be a different type of game."
Chalmers singled out his defense of Tony Parker in pick-and-role situations as a key element he needed to focus on going into Game 2.
"His rejects out of the pick and roll. I want to keep him going into the pick and keep him going into the heart of our defense."
Chalmers said the Heat overall were happy with how they defended Parker, one of the league's best in the pick and roll, in that set in Game 1.
"They didn't really hurt us too much in the pick and roll. We'll adjust as they adjust."
Parker scored 21 points but needed 18 shots to do so, the last two coming on an incredible floater, leaning under LeBron with nanoseconds left on the shot clock.
Game 2 is Sunday at 8 p.m. ET.