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 "Finoti"]
[Black "Reingard"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r1k1/1pb3pp/p1p2p2/2P3r1/1P1PP2n/P6q/2Q2RP1/2B1RNK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rxg2+ 2. Rxg2 Nf3+ 3. Kf2 Qxg2+ 4. Kxg2 Nxe1+ 5. Kf2 Nxc2 { White wins
with a large material advantage. } 0-1