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 "Unknown301"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r7/1pp2kpp/8/p3p2K/6P1/P2P3P/1PP1Nb2/R7 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... g6+ 2. Kh6 Kg8 3. d4 Be3+ 4. g5 exd4 5. Rf1 d3 6. cxd3 Bc5 7. Ng3 Bf8+ 8. Rxf8+ Rxf8 { Black wins with a large material advantage. } 0-1