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 "Rossetto"]
[Black "Sherwin"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "6k1/1p2pp2/3n1b1p/3P4/PB3pP1/1B5P/4R1K1/r7 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rb1 2. Bxd6 f3+ { A intermediate move. } 3. Kxf3 Rxb3+ 4. Kg2 exd6 { Black wins with a large material advantage. } 0-1