Luciano Spalletti stressed patience while Inter Milan adjust to his tactics after beating his former team Roma 3-1 on Saturday.
Spalletti has now won both of his Serie A games in charge of Inter, after leaving Roma at the end of last season.
Despite the glossy scoreline, Spalleti admitted that his team needed "a bit of luck" after Edin Dzeko opened the scoring and Roma hit the post three times before Inter could respond.
"In the first half, we were not quick enough moving the ball, so Roma got back into their shape and kept winning back possession," Spalletti told Mediaset Premium. "Everyone knows that if you play in this type of arena and don't have a clear idea, you're going to get beaten.
"In the first half, Roma were better than us. Of course, you need a little bit of luck -- which we had. But we have started to change the mentality of this Inter side and it takes a while to get used to this approach.
"The game against Fiorentina last week was also dangerous, so beating them and Roma consecutively should build confidence."
Mauro Icardi scored twice to turn the game around, but he also said it would take some time for Inter to completely fall in line behind Spalletti.
"We had a wonderful second half -- we came out fighting and you could see the difference on the pitch," Icardi said. "It is just the start of a new season under a new coach, so we are getting accustomed to the dynamics and mistakes can happen.
"We did well playing in the opposition half. This victory is a really good sign."
Meanwhile, Roma coach Eusebio Di Francesco could only praise his side's performance and lament the close calls in the first half.
"The fact remains that, for 70 minutes, Roma were not just good but great," he told Mediaset Premium. "We were fantastic in every way. We kept pressing to win possession back in their half and caused all sorts of problems.
"We should have been more clinical and finished more of the chances that we managed to create. Inevitably, though, with the lack of a genuine right-back, our moves were a little lopsided.
"It's a pity about the result -- I know the media will only look at that -- but I have to examine the performance. I saw definite steps forward.
"If there was one team that deserved to win and have a two-goal advantage, it was Roma and that's all there is to it."