Paul Heckingbottom admits Sunday's League One play-off final will be a 'clash of styles'.
The Reds, who have played some excellent football in the 4-1 win at champions Wigan and 6-1 play-off victory over Walsall, take on a Millwall side known for a more direct approach as well as a reliance on strikers Steve Morison and Lee Gregory who have 46 goals between them this season.
Millwall finished fourth, seven points ahead of the sixth-placed Reds and beat another Yorkshire team Bradford City 4-2 in the semi-finals while Barnsley were thrashing Walsall 6-1.
"It's definitely a clash of styles but it's two good teams and two of the most in-form teams since the turn of the year," said Heckingbottom.
"They've got a style of play that suits their best players. They have an identity as a football club and they try to represent their fans in the best possible way, like we do.
"We'd go a long way to winning if we stopped Lee Gregory and Steve Morison. They get the ball up to them as soon as they can. We know Millwall will put us under severe pressure at some point but that shouldn't bother us. We don't have to dominate the game for 90 minutes, we just have to win it.
"We can't affect what Millwall do other than by imposing ourselves on them. We've got used to big games this season. We've built each game up as massive and we've seen the benefit of that because the lads are performing under pressure and winning big games. We haven't frozen."
Heckingbottom – who won the League One final as a player with the Reds ten years ago – also believes Barnsley's experience of collecting the Johnstone's Paint Trophy at Wembley last month could be a key factor.
"It will 100 per cent be an advantage. "Our players have experienced winning at Wembley from being behind at half-time. They have gone through the full range of emotions there and that will stand us in good stead. We're staying in a different hotel but we're doing the same build-up. When we went down the first time we stopped off at Wembley on the Friday and tried to recreate a cup final for them.
"We played crowd noise and the song that they would be walking out to and rehearsed the last five minutes in the dressing room and the walk onto the pitch. We don't need to do that this time because we've done it for real.
"They will be a bit more relaxed at Wembley this time and enjoy it more. They have done the media before and got the special suits before so they know what to expect and it will be less distracting this time."
Barnsley took 23,676 fans to the JPT final and are expected to be backed by slightly fewer at the more expensive play-off game. Chief executive Ben Mansford said: "I am absolutely delighted that we are getting to take this club and our fantastic supporters to Wembley again. To have more than 20,000 fans at Wembley again is brilliant, especially considering they have already had to pay for the last Wembley final, season tickets for next season and the play-off games.
"It's a lot of money in a short space of time but we really appreciate the support. I think we might just come a little bit under the number we sold for the Johnstone's Paint Trophy final but it's an incredible following."
