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 "2000.??.??"]
[Round "?"]
[White "Berg"]
[Black "Zezulkin"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "7k/7p/p2p3Q/4br2/4pqN1/6R1/5P1P/7K w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Nf6 Bxf6 ( { Black can try: } 1... Qxh6 2. Rg8# ) ( { Black can also try: } 1... Rxf6 2. Qg7# ) 2. Qf8# 1-0