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 "Unknown416"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3rr1k1/p4pp1/1p4np/2PQ4/8/P1P5/2qB1PPP/2R1R1K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qxc1 ( { Black can try: } 1... Rxe1+ 2. Bxe1 Rxd5 3. Rxc2 Rxc5 { With a
likely draw. } ) ( { Black can also try: } 1... Qxd2 2. Rxe8+ Rxe8 3. Qxd2 { White wins with a large material advantage. } ) 2. Qxd8 Qxe1+ 3. Bxe1 Rxd8 { Black wins with a large material advantage. } 0-1