They have a done a good job and you can see that in their performances.
The Scarlets, looking to reach their first-ever final in Europe's premier club competition, were not overawed by the momentous occasion.
Both teams take to the field. In fact, they did little wrong, but were simply outplayed by Leinster in front of the partisan crowd inside the Aviva Stadium. But as the crowd began to find their voice, Leinster found their range as they picked the Scarlets apart.
Scarlets scored their only try of the match with a minute to play as Tadhg Beirne escaped a Leinster tackle to dive over at the posts, but it was nothing more than a consolation as the Irish province sealed a place in the Bilbao showpiece final.
"Their kicking game was quite good, they won the aerial battle and that helped them to win the territory".
Perhaps wary that Scarlets could come out swinging in the second half, Leinster kept to their scoring and on the fourty-ninth minute, Scott Fardy, who put in a man of the match display, crashing over for the fourth try.
Henshaw and fellow Ireland centre Garry Ringrose epitomised Leinster's nearly robotic accuracy, which helped the hosts pull further clear as McFadden touched down in the corner for his side's third try on the cusp of half-time.
Leinster have taken plenty of big scalps on their European journey this year, but none will have tasted as sweet as this dominant defeat of Scarlets.
Scarlets enjoyed a few minutes on the front foot, from which they mined one penalty, but they could not stop Leinster scoring another try that left them 24-9 up at half-time. With his team on the attack inside the 22, the flyhalf called for the ball and once he was in possession he stepped and swerved to unlock the Scarlets' defence for a self-converted effort.
Tries for James Ryan, Cian Healy, Fergus McFadden, Scott Fardy and Johnny Sexton proved more than sufficient to crush any Scarlets resistance as the Irish province offered the flawless advert for the growing capabilities of northern hemisphere rugby, particularly in light of Ireland's Six Nations brilliance.
Leading by 29 with 20 minutes remaining, Leinster - clearly confident that the win had been secured - had the luxury of taking off Sexton as a precaution.
Tries Ryan, Healy, McFadden, Fardy, Sexton Cons Sexton 5 Pen Sexton.
"I'm still a Scarlets player", he said, "and will be until the end of the season". Conversion: Leigh Halfpenny. Penalties: Halfpenny (3).
"They were more direct, a bit like Ireland and, although we held them out the back, they got quick ball which stopped our line speed and then they had ball carrier plus two, that put our jackallers out of the game".
Scarlets: R Patchell; L Halfpenny, S Williams (S Hughes 75), H Parkes, S Evans (D Evans 75); D Jones, G Davies (A Davies 71), R Evans, K Owens (capt) (R Elias 53), S Lee (W Kruger 53), T Beirne, D Bulbring (L Rawlins 55), A Shingler (S Cummins 67), J Davies, J Barclay (W Boyde 71).