Having reached 21 points at the midway stage of the campaign, more than halfway to their target of 40 points for the season, the league's newcomers remain on course to secure a second successive year in the top flight.
However, Meier is not counting his chickens just yet.
"We are delighted with this success, but 21 points is not a cushion we can relax on," he said.
"It has not been a bad first half of the season for us. Our side has huge will and motivation, but it's obvious that there are things we need to improve.
"However, everybody has deserved to have New Year's Eve off."
Hannover coach Mirko Slomka was less satisfied with the result, which leaves his side out of the European places going into 2013.
"The first half of the season does not have a happy ending for us," he said. "It looks like we have learnt nothing from our recent games.
"We have got to be able to defend a 1-1 scoreline away from home over the distance and take a point away.
"A point would have done us good. But congratulations to Dusseldorf for a great first half to the season - 21 points is a great result."