The Gunners go to London rivals West Ham on Sunday, looking to get back to winning ways after last weekend’s 2-2 draw at Liverpool.
“You need luck in the right moment,” said Arteta.
“That luck, and where it comes from, is going to be really important. There is another part in sport, sometimes it’s about inches. Those inches have to go your way.
“We are where we are. We are happy where we are. Now we have to finish the job. In order to do that, we demand that extra bit from everybody.”
What separates Arsenal and Manchester City’s run-in is a stark contrast in games remaining. The Gunners have only the Premier League to compete for, while City have a FA Cup semi-final next week, while they have one foot in the Champions League semi-finals.
Asked if the amount of fixtures will play a part, Arteta added: “We want our players to be as fit as possible and available.
“We have had some issues, especially in the last few months, with some important players. We want to have everyone available, fit and at their best.”