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 "Unknown207"] [Result "0-1"] [Annotator "David Hayes"] [BlackElo "0"] [FEN "2k3r1/1pn1q3/p2p3Q/P2Pp2n/2N1P3/2N4p/2P4K/1R2R3 b - - 0 1"] [SetUp "1"] [TimeControl "0"] [WhiteElo "0"] 1... Rg2+ 2. Kxh3 Rg3+ 3. Kh2 Qh4# 0-1