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 "Unknown51"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/p1p5/1pk5/2b1R3/2Q4P/6PB/P1Pr1r2/6K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rg2+ ( { Black can try: } 1... Rd1+ 2. Bf1 Rdxf1+ ( 2... Rfxf1+ 3. Kg2 Rg1+ 4. Kh3 Rh1+ 5. Kg2 Rhg1+ 6. Kh3 Rh1+ 7. Kg2 Rhg1+ { Draw by repetition of
position. } ) 3. Qxf1 Rxf1+ 4. Kxf1 { White wins with a large material
advantage. } ) ( { Black can also try: } 1... Rf4+ 2. Rxc5+ bxc5 3. Qxf4 { White
wins with a large material advantage. } ) 2. Kf1 Rg1# 0-1