Delle Alli, 17, reportedly attracting interest from a host of top-flight clubs, did nothing to harm his reputation when he scored a stunning volley from 25 yards to give the Dons a 39th-minute lead.
Home skipper Carl Baker equalised 12 minutes after the interval as Coventry came out strongly, but substitute Izale McLeod stopped them in their tracks with his first touch after stepping off the bench before Baker missed a penalty.
Pressley said: "The first-half was a game of few moments and we had a few great opportunities.
"We created a lot of good opportunities again in the second and the penalty miss was at a crucial time in the game, we were on top.
"Probably what let us down was our final pass, but in terms of the group's attitude - it was fantastic.
"Their first goal was outstanding. You can defend these situations a bit better, but we defended the first ball and it falls to the edge of the box and it's an incredible strike.
"We needed to be a little bit more aggressive in our passing and look towards our strikers.
"We were on the front foot in the second-half and but for an exceptional one moment it's disappointing we haven't got anything."
Coventry look to have done enough to avoid being dragged into a relegation fight, but need another win to calm any nerves in the final weeks.