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 "1763.??.??"]
[Round "?"]
[White "Dolli"]
[Black "Anon"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "1r6/6kp/6p1/5RQ1/8/P1P1p3/KP6/2q5 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1. Qf6+ { Or 1. Qe7+. } 1... Kh6 2. Qh4+ Kg7 3. Qd4+ Kg8 ( { Black can try: } 3... Kh6 4. Qf4+ Kg7 5. Qe5+ Kh6 6. Rh5+ gxh5 7. Qf6# ) 4. Qd5+ Kg7 ( { Black can
try: } 4... Kh8 5. Qe5+ Kg8 6. Qxb8+ Kg7 7. Qf8# ) 5. Qe5+ Kh6 6. Rh5+ gxh5 7. Qf6# 1-0