Make sure to use your king! When all else is equal, the side with the more active king will get the upper hand. If you're unsure how to evaluate a knight endgame, try to see which king is closer to the center or queenside -- the closer king will be able to contribute to the action first.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown241"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/p5pk/2P4p/8/2PQ4/P3p1q1/KB2Pr2/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qd7 Rxe2 ( { Black can try: } 1... Qg2 2. c7 Rxe2 3. Qf5+ Qg6 4. c8=Q Qxf5 5. Qxf5+ Kg8 6. Qd5+ Kf8 7. Qf3+ Ke7 8. Qxe2 { White wins with a large
material advantage. } ) 2. Qd3+ Qg6 3. Qxe2 Qxc6 { White wins with a large
material advantage. } 1-0