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 "Unknown287"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r4b2/3Qn3/pkr1q3/R2p4/1PpP4/2P3B1/7P/R5K1 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Rxa6+ Rxa6 2. Qd8+ Kb5 ( { Black can try: } 2... Rc7 3. Qxc7+ Kb5 4. Qc5# ) 3. Ra5+ Rxa5 4. Qxa5# 1-0