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 "Unknown555"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "2r3k1/5pp1/8/2Np4/3P2q1/8/3Q3K/4R3 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Rc6 2. Qg2 Qh4+ 3. Kg1 Qxe1+ 4. Kh2 Rh6+ 5. Qh3 Qf2+ 6. Kh1 Rxh3# 0-1