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 "Unknown365"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/3q2k1/3p2p1/1ppPp1Q1/r3Pp1N/2P2K2/2R5/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qh3+ 2. Kf2 Qe3+ 3. Kg2 Qxe4+ 4. Kh3 Qd3+ ( { Black can try: } 4... Qxc2 5. Qe7+ Kh6 6. Qf8+ Kh5 7. Qh8+ Kg5 8. Qd8+ Kh6 9. Qh8+ Kg5 10. Qd8+ { Draw by repetition of position. } ) 5. Nf3 Qxf3+ 6. Kh2 ( { White can try: } 6. Kh4 Qh1+ 7. Kg4 Qg1+ 8. Kh4 f3+ 9. c4 Rxc4+ 10. Rxc4 Qxg5+ 11. Kxg5 bxc4 12. Kg4 f2 13. Kg3 f1=Q { Black wins with a large material advantage. } ) 6... Qh5+ 7. Qxh5 gxh5 8. Kh3 Kf6 9. Kh4 Kf5 10. Kxh5 e4 11. Rb2 e3 12. Rxb5 e2 13. Rb1 f3 14. Rg1 f2 15. Rg5+ Kf6 16. Rg6+ Kf7 17. c4 f1=Q 18. Re6 e1=Q 19. Rxe1 Qxe1 { Black wins with a large material advantage. } 0-1