Matheus Cunha had Wolves ahead before Villa stormed back through goals from Ollie Watkins, Ezra Konsa and Jhon Duran.
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Emery said: "We want to win matches easier than we did. We are showing how difficult it is to win in the Premier League - last week against Everton.
"We were suffering in the first half but the second half was completely different. I am very happy because we won. It was very important we changed our energy and we played to win in the second half."
On Duran, he added: "Good impact again. The most important thing is we won. We will need all the players in the matches we play in the next few weeks."