Sheffield United manager Danny Wilson said the hard part was still to come after seeing his side squeeze past Stevenage to reach the npower League One play-off final at Wembley on May 26.
After a goalless first leg at Broadhall Way last Friday night, a game short on quality and clearcut chances appeared destined for extra-time until second-choice striker Chris Porter headed home an 85th-minute winner to clinch a 1-0 aggregate win and set up a final showdown against the winners of Tuesday night's other semi-final between Huddersfield and MK Dons.
"Now for the hard part - big style," said Wilson. "It's a difficult one to call with the two teams in front of us.
"Everybody will suppose a 2-0 lead will be enough for Huddersfield to get through, but you just never know.
"We've just seen how tough the second leg can be."
Blades right-back Matt Lowton produced a rare moment of class late in the game to supply an inch-perfect cross for Porter to head home the tie's only goal.
Porter was denied in the seventh minute by Stevenage goalkeeper Chris Day's brilliant reflex save, but until Lee Williamson and Matt Hill - with a 30-yard thunderbolt - threatened in the second half, the game was void of decent chances.
"I think we did deserve it," said Wilson, who felt his side did create chances. "We take nothing away from Stevenage by the way and they have been in the two games.
"We shaded it and we played some great stuff at times. We were incisive and created a lot of chances in the second half. It was a real good cup tie.
"The performance was terrific today, we went out with a gameplan and saw it through to the letter.
"It's a step closer to where we want to be. But the hard work starts now. It will be tough whoever we play."
Stevenage manager Gary Smith, who replaced Graham Westley in January, could not hide his disappointment.
The Hertfordshire club were chasing a third straight promotion after a meteoric rise from the Blue Bet Square Premier Division to npower League One, but found it a bridge too far in South Yorkshire.
Smith's side looked like they would have readily taken extra-time before kick-off and save for Scott Laird's second-half shot that flew inches over the crossbar mustered little else in the final third.
"It is very disappointing," Smith told Sky Sports. "I thought we'd weathered the storm enough to get to extra-time.
"But I suppose if I get a little longer to think about it they created one or two better chances than we did."
Smith added: "On games like tonight and occasions like tonight you have got to threaten your opponents goal and we just didn't do enough.
"Of course we wish Sheffield United all the best. They played ever so well tonight and we probably always knew a goal might be enough to take either side through, so good luck to them and good luck to Danny [Wilson] and Sheffield United."
