Brian Flynn admitted he went through "all the emotions" while watching his Swansea side battle to preserve their Football League status on the last day of the season.
Flynn has already started planning for next season
The Swans eventually secured the vital win they needed to avoid Third Division relegation, thanks mainly to a James Thomas hat-trick.
Two defensive errors by Michael Howard and Lee Jenkins in the first half handed Hull two sloppy goals and brought the relegation trap door a step nearer.
But Thomas brought the Swans level minutes before the break and a further two goals in the second half put the result beyond doubt and saved Swansea from the Nationwide Conference.
Flynn told BBC Sport: "We started the game brightly - we got the penalty but then gave them two goals.
"Obviously they were mistakes and I had said leading up to the game that we didn't want individuals to be villains or the cause of a defeat.
"But Michael Howard and Lee Jenkins showed tremendous resolve in the second half because it could have effected them.
"But there were heroes out there today. Obviously the golden boy (James Thomas) will be talked about - the local lad scoring a hat-trick in the last game of the season.
"But they were all heroes."
Flynn took over at The Vetch in September when the side were rock bottom of the Third Division.
He re-built the side by signing a host of experienced loan players and gradually began to get the results.
I could sense a determination in the dressing room to stay in the Football League
But only two points from four games in April meant Swansea's fate would be decided on the final day of the season.
Flynn, though, said he never had any doubts that his side would pull through.
"It's easy for me to say now, but I knew with 20 games to go we would get out of it," he said.
"I could sense a determination in the dressing room to stay in the Football League.
"The form - take away the Easter period - has been as good as a top six side."
Flynn revealed he has been planning for next season since Christmas, and has vowed to be challenging for trophies rather than fighting off relegation.
"This should never happen again," he said.
"I know it's only words, but we must make certain that Swansea City are at the other end of the league."