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 "Unknown190"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r4r2/1R3p2/2p5/p3pN1k/4P2b/2P4Q/6PK/4q3 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rb1 Qf2 ( { Black dare not try: } 1... Qxb1 2. Qxh4+ Kg6 3. Qh6# ) 2. Rf1 Kg5 3. Rxf2 Bxf2 4. Nd6 Rad8 5. Qf5+ Kh6 6. Qf6+ Kh5 7. Nxf7 Rxf7 8. Qxf7+ Kg4 9. Qf5+ Kh4 10. Qxf2+ Kg4 11. Qf5+ Kh4 12. g3# 1-0