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 "Leipzig"]
[Date "1960.??.??"]
[Round "?"]
[White "Nejkirh"]
[Black "Matanovic"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2rq4/pp3p1k/2np1b1p/2pN1P2/2P5/3B2Q1/PP4PP/4R1K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Re8 Qxe8 ( { Black can try: } 1... Bd4+ 2. Kf1 Qxe8 3. f6+ Kh8 4. Qg7# ) 2. Nxf6+ Kh8 3. Nxe8 Rxe8 { White wins with a large material advantage. } 1-0