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 "Unknown072"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r3r1k1/ppp3p1/3p1p1p/3P4/2P2n1q/1PQ2PNP/PB5P/R4RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Note that white is up a whole piece. So black must make a decisive move. } 1... Re2 ( { Black can try: } 1... Ne2+ 2. Nxe2 Rxe2 3. f4 { White wins with a
large material advantage. } ) ( { Black can also try: } 1... Nxh3+ 2. Kh1 Nf4 3. Qd2 { White wins with a large material advantage. } ) 2. Nxe2 ( { White can
try: } 2. Rf2 Nxh3+ 3. Kf1 Rxf2+ 4. Ke1 Rxh2 5. Kd1 Qxg3 6. Qe1 Qxf3+ 7. Kc1 Qg2 8. Qc3 Rh1+ 9. Qe1 Rxe1# ) 2... Nxe2+ 3. Kh1 Nxc3 4. Bxc3 { Black wins with a
large material advantage. } 0-1