The Black Cats face Manchester United this weekend.
"We have to try to get that first victory in the league and we are in the right frame of mind to get it. The main difference we have seen under Kevin Ball is that we have seen more of the ball and there is happiness around the place. You could see a huge difference straight away," said Cuellar.
"We know we can improve and stop the mistakes. But if you can hold your head up, that is important.
"We did that after the Liverpool setback. We played well in that game, and deserved to pick up a point. However, their quality up front won it for them."
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