George Hirst admitted that Pompey failed to enact their game-plan before the interval at Fratton Park.
But he felt it was a different story in the second half, as they struck four times to secure a comfortable victory over Doncaster.
The on-loan striker doubled the advantage after Reeco Hackett had opened the scoring, while Aiden O’Brien and Sean Raggett added further goals late on.
And Hirst knew that the Blues had to allow their most artistic players to deliver in order to break down Rovers.
He said: “It was a really big win for us – our second in a week – and I was delighted to score another goal.
“When we went in at the break, we knew that we needed to take our performance up another 10 per cent or so.
"The manager said that we needed to trust ourselves more and that’s what we did to come away with a 4-0 victory."
“It wasn’t particularly great in the first half and we knew that there were extra gears for us to move into.
“But after the break I thought we displayed a real fight and a determination to prove a point to some of the teams around us in the table.
“I think that we went too long when with the players we had out on the pitch, we were good enough to play some football.
“The manager said that we needed to trust ourselves more and that’s what we did to come away with a 4-0 victory.
“We were so much better in the second half and were able to get our most creative players on the ball.
“With them being able to come into the game a bit more, that gave me and Tyler Walker a chance up front.”