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 "Unknown43"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1r2r1k1/p1p3p1/1p2pp1p/3q4/3P1R2/P1P3P1/1P3P1P/R1Q3K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... g5 2. c4 Qb7 { Stopping all further play on black'queen while still
preventing the rook from escaping to e4. } 3. Rxf6 Kg7 4. Rxh6 Kxh6 { The rook
sold itself for two pawns, but black still wins with a large material
advantage. } 0-1