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 "Unknown086"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r7/pp3qkp/2p2rn1/3pn1p1/5p2/1QPB3R/PP1B2PP/4R2K w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxe5 g4 2. Rhh5 Nxe5 3. Rxh7+ Kg8 4. Rxf7 Rxf7 5. Qc2 { White wins with a
large material advantage. } 1-0