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 "Unknown623"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2kr2r1/pp2qp1p/2pb1p2/4n3/6PB/3P1P1P/PPPQ4/2KR1B1R b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nxf3 2. Qf2 Nxh4 3. Qxh4 Qe3+ 4. Kb1 Qf3 5. Be2 Qxe2 { Black wins with
a large material advantage. } 0-1