Warren Gatland said watching his Wales team withstand a second half Samoan onslaught was too close for comfort, but he is happy to come away from Cardiff with the win.
Wales registered their first win of the Invesco Perpetual Series 09 by edging Samoa 17-13 in front of 58,907 fans on Family Night.
And the huge crowd went home happy, but had to endure a nervy final 20 minutes after Wales failed to turn their dominance into points.
Coach Gatland explained afterwards, "We wanted to be more ruthless in our approach, but unfortunately we weren't. We created a lot of chances and line breaks and e should have put the game away.
"But we simply weren't clinical enough. We have to learn from our mistakes and in the first-half we kept kicking the ball away.
"We felt physically that if we kept playing with tempo their forwards would struggle and tire later on.
And the Kiwi coach would have been as nervous as anyone as Samoa pulled to within a converted try over a monumental win after Mapusua scored an interception try on the hour mark.
Gatland said; "It was a little bit too close for comfort in the end and we put ourselves under pressure. We made 11 line breaks to their two and our finishing wasn't good enough.
"We should have put the game away comfortably. The game should have been out of sight by the time they got their interception try - that was a 14 point try because if he hadn't have caught it we would probably have scored.
"But we have come away with a win."
Captain, and Man of the Match Ryan Jones commented: "It was about as tough as it gets in Test match rugby. The Samoans gave everything and really hit hard.
"But our boys dug deep for the victory that we wanted and needed. There is a courage, strong work rate and work ethic with my guys and it was great we kept them out in the last five or six minutes.
"We need to look at cutting out the mistakes. We have been offering so much, but not quite delivering - we haven't had that clinical edge in our game.
"It has been a case of the last pass or the last phase letting us down.
"But fair play to the Samoans, they came together on Sunday and put a fantastic performance together.
"The game against Argentina is going to be very difficult and we have got to take more ownership of the game and cut down on the errors.
Wales Head Coach Rob Howley talks to WRU TV's Sebastian Barrett about the 36-man squad he has just named for the forthcoming Under Armour series, which includes two uncapped players, Ospreys duo Sam Davies and Rory Thornton.
Head coach Rowland Phillips is deligthed he can now call BT Sport Cardiff Arms Park home for his Wales Women's side, who launch their international season next month with games against Scotland and UK Armed Forces in the heart of the capital city.
Wales Sevens star Sam Cross has put his home town club of Brynmawr on the map after winning a silver medal at the Rio Olympics with Team GB. His club have now honoured him by naming their players bar after him, as WRU TV discovered at the official launch, recently.
One of the newest members of the Principality Premiership, Bargoed admit it's proving to be a steep learning curve at the highest level, but are determined to become a force to be reckoned with. WRU TV visited the club last weekend when they took on Llanelli.
Table-topping Aberavon travel to north Wales to tackle RGC 1404 as both teams defend unbeaten starts to the season in the Principality Premiership. WRU TV's Graeme Gillespie visited the Wizards to see how their preparations were going for the game of the weekend.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.
Cardiff managed to keep their unbeaten record at home intact, but only just as Bridgend made them work extremely hard before the Blue and Blacks secured a hard fought Principality Premiership win at the BT Sport Arms Park last night.
Former Wales back row Andy Powell gives a guided tour of The Wern, home of Merthyr RFC, who are determined to prove a lot of people wrong and make their mark in their first season in the Principality Premiership.