Widnes coach Denis Betts watched his side go top of the table with their first win at Huddersfield since the advent of Super League and warned the real test will come as they battle to stay there over the next month.
The Vikings, who finished in the bottom four in 2015, made it three wins from their first four games with a 36-18 triumph over the injury-hit Giants at the John Smith's Stadium.
"We've not won here for 20 years and it was a great overall performance," Betts said. "There are things in there we can do better - Joe Mellor was finding ways not to score a try.
"The lads are really made up with the fact we've been away from home three times and we've come out with six points from four games. We would have taken that early in the year.
"This next month the games are going to be coming thick and fast and it will be a real test for us. It becomes a war of attrition and the squad gets tested.
"It's nice (to be top) at this stage, we've made a really good start but we've got to make sure we get a bit more ruthless."
Wingers Corey Thompson and Stefan Marsh scored two tries apiece, with Australian Thompson taking his tally to six in just four Super League appearances to become an early fans' favourite.
"It's exciting when he gets the ball in his hands," Betts said. "Fans hold their breath and, when he gets one on one, he's going to score a try.
"It's nice to have that on both sides. We're blessed for wingers. Patrick Ah Van is close to returning and Paddy Flynn is knocking down walls to try and get in the side."
The result leaves Huddersfield without a point and above bottom of the table Leeds only on points difference as they prepare to take on the reigning champions at Headingley in their next match on Friday.
"Historically that's a top-three game but both teams have copped some injuries and it will be a survival of the fittest," said Giants coach Paul Anderson. "Let's see who can throw out the healthiest team."
Huddersfield went into the game without eight members of their 25-man squad through injury and they lost scrum-half Jamie Ellis with a shoulder injury after just 24 minutes which will almost certainly rule him out of Friday's game.
Anderson expects Danny Brough, Eorl Crabtree, Joe Wardle and Kyle Wood to return within the next fortnight but, more importantly, is hoping for an improvement in his players' attitude.
"Three quarters of our salary cap have watched today," he said. "One or two might have a chance for Friday but we've got to battle on. The key is to stick together.
"I thought Widnes were very good we were poor and pretty soft if I'm honest.
"It was the same team (that almost beat Wigan) but our attitude was not quite right today. If your attitude is not right, you get challenged and Widnes did that. They ran harder than us and they had more vigour in everything they did.
"I've just congratulated Denis because they got what they deserved. W e got what we deserved.
"In the first half we completed at 60 per cent, gave away seven penalties and had a man in the bin, that tells the whole story."