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 "Unknown030"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1b1kb1r/ppq2pNp/2p2p2/3p3B/2nPp1Q1/2N1P1P1/PPP2P1P/R4RK1 b kq - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Kd8 ( { Black can try: } 1... Bxg7 2. Qxg7 Rf8 3. Qxf6 Qe7 4. Qxe7+ Kxe7 { White wins with a material advantage. } ) 2. Nf5 Qd7 3. f3 Qxf5 4. Qxf5 Bxf5 5. fxe4 Bg6 6. Bxg6 fxg6 7. exd5 Nxe3 8. Rxf6 Bg7 9. Rf7 Bxd4 10. Kh1 Bxc3 11. bxc3 cxd5 12. Rxb7 Rf8 13. Rxh7 Rc8 14. Rxa7 Rxc3 { Black wins with a
large material advantage. } 0-1