"The gaffer is working on telling me to be a bit sensible because I'm still learning the game at the moment," he told BBC Radio Norfolk.
"Sometimes I need to think about what I do before I go in for a challenge, maybe I get too tight."
Striker Grant Holt, who has scored four goals in his last four games, will be suspended for the weekend visit of Portsmouth after collecting his fifth booking of the campaign in the 2-1 defeat of Derby.
But Barnet is still one misdemeanour away from facing the same fate.
You can see goals coming from all over the pitch, we just need to stop the conceding of goals
Norwich City defender Leon barnett
"I maybe could have got a booking, I was quite fortunate, other referees might have given me a yellow straight away," he admitted.
Victory at Pride Park extends City's unbeaten run to six games and takes them up to fourth in the Championship.
A series of draws against Burnley, Millwall, Reading and Leeds preceded back-to-back to wins for Paul Lambert's side and Barnett believes the Canaries are becoming astute in the art of finishing opposing teams off.
He said: "I think we're learning every game, sometimes when you're under the cosh in the last few minutes maybe you need one midfielder to drop in and help out or a goalkeeper to come for a cross.
"I think we did that more times than we did against Millwall and other games where we've drawn.
"We've definitely got goals in our team, Holty's on fire, Chrissy Martin's doing well and Simeon Jackson's on the bench and is fighting them all the way.
"You can see goals coming from all over the pitch, we just need to stop the conceding of goals."
Source: BBC Sport
Source: BBC Sport