Jacques Nienaber admits Leinster have "lots to work on" if they are to contend with Toulouse in the Investec Champions Cup final.
The Blues are into a third straight final after seeing off a late Northampton Saints comeback to win 20-17 at Croke Park on Saturday.
They have two rounds of URC games, against Ospreys and Ulster, before the showdown with the five-time European champions in London on 25 May.
A James Lowe hat-trick and a masterclass from scrum-half Jamison Gibson-Park had the hosts 20-3 in front with 22 minutes to play.
From there, the English league leaders scored two converted tries and fell just short of an astonishing comeback.
"The whole world will know we were in control for 60 minutes," former Springboks head coach Nienaber told RTÉ Sport.
"We had good control of the game and then obviously with the quality of opposition that we had, you can see why they are the top Premiership team currently; they kept coming at us and we had to finish out the game in the last eight minutes or so.
"Some of it, we did really well, some of it we could have done better. That's probably the take-home.
"From our view there is lots to work on going into the final. But we’re not thinking about the final just yet.
"I said to the lads that if we lift our heads up too high and start looking at the horizon we might fall over the obstacle right in front of your face."
Ross Byrne, who kicked five points, missed three off the tee with a penalty in the 63rd minute and Nienaber said closing out games is about being ruthless when the chances arrive.
"I think it boils down to execution, you must take the opportunities that you create. And that’s it!" said the 51-year-old.
"If you get an opportunity, you must capitalise on it. We had a couple of opportunities that we didn’t capitalise on, which was our own wrongdoing, some of them.
"But some of them were due to the quality of opposition that we had in the Saints."
Leinster 20-3 Northampton
— RTÉ Sport (@RTEsport) May 4, 2024
It's a hat-trick for winger James Lowe Northampton Saints facing a huge uphill challenge to stay in the game
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Meanwhile, Leinster confirmed that Jimmy O’Brien, who featured off the bench for his first appearance since December, came through the game with no issues, while Tommy O’Brien has also fully recovered from a hamstring injury.
Garry Ringrose (shoulder) and Hugo Keenan (hip) will be further assessed this week before a decision is made on their availability to face the Ospreys (Saturday, 7.35pm).
Ciarán Frawley, who came off injured in the final minute against Northampton, trained in Dublin on Monday.
"Garry is probably taking a little bit longer than expected but both parties must be happy," said the South African.
"He must be happy in his mind that he will in a position to deliver a world-class performance because that’s what needed at the back end of the competition, both URC and Europe.
"He must be at that level in his mind.
"Ciarán trained today, he did the whole training session.
"Hugo is another one who is taking a little bit longer than we expected and it’s exactly the same as Garry. We must be happy."
There were no further updates on James Ryan (arm) and Alex Soroka (foot).
Watch Munster v Connacht in the URC on Saturday from 4.45pm on RTÉ2 and RTÉ Player, follow a live blog on rte.ie/sport and the RTÉ News app and listen to updates on Saturday Sport on RTÉ Radio 1
