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 "Unknown002"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r5k1/5p1p/6p1/8/8/4Q3/rq1R1PPP/3R2K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qxd2 2. Qxd2 Rxd2 3. Rf1 { Black wins with a large material advantage. } 0-1