Joint-caretaker boss Mark Lillis masterminded Huddersfield's first npower Championship win in 13 matches and said: "It's all about putting confidence back into the players."
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Lillis, in temporary charge while Town find a replacement for Simon Grayson, halted the club's slide down the table with a vital three points.
Lillis said: "I have been in charge about a week now and it was all about getting in amongst the players and finding out what makes them tick, what their families are like.
"If you get the respect of the players you have a chance."
Striker James Vaughan scored his fifth Town goal with a smart finish in the 65th minute and Lillis said: "That will do him the world of good.
"Lee Novak scored on Saturday (against Leicester) and Vaughany scored tonight and they will take confidence from that.
"The confidence is starting to return to all the players and that's what happens when you work hard, tackle and fight.
"Neil Danns was shouting to me that his calves were cramping up and I shouted back 'that's good'. That's what I want - for players to come off with their tongues hanging out, all sweaty."
Town stopped the Palace flair players - including Manchester United-bound Wilfried Zaha - and Lillis said: "We had to stop their creative players and Zaha. That's down to talking things through with the players and playing to their strengths."
A win would have lifted Palace second but Town battled hard, with captain Peter Clarke immense at the heart of the defence.
Adam Clayton's brilliant through-ball set up Vaughan, who had a loan spell at Selhurst Park, for a clever finish.
Before that Palace goalkeeper Julian Speroni twice denied another former Palace player, Danns.
At the other end Yannick Bolasie proved a big threat and almost grabbed an equaliser in the fifth minute of stoppage time - but Alex Smithies produced a superb save.
There were reports tempers became heated in the tunnel after the contest and Palace boss Ian Holloway refused media interviews.
Lillis said: "We are two passionate managers. There were a few tackles around."