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 "Unknown97"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A01"]
[FEN "4B3/4b3/8/P2k1K2/1pp4p/7P/P7/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... b3 2. axb3 c3 3. Bf7+ Kd6 4. Bc4 c2 5. a6 c1=Q 6. a7 Qc2+ 7. Kf4 Qf2+ 8. Ke4 Qxa7 { Black wins with a large material advantage. } 0-1