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 "corr."]
[Date "1934.??.??"]
[Round "?"]
[White "Adam"]
[Black "Demitriescu"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2r3k1/4qp1p/p5p1/2n3P1/1p1QP2P/1P4N1/PK6/2R5 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qe5 2. Qxe5 ( { White can try: } 2. Rd1 Qxg3 { Black wins with a large
material advantage. } ) 2... Nd3+ 3. Kb1 Rxc1# 0-1