Pedal at a cadence that feels fast but comfortable for you. Don't worry too much about the number, get the feeling.
Keep a constant but relatively light pressure on the pedals.
I like to be in a gear where I feel I could accelerate a little without shifting.
Focus on light pressure/fast cadence keeps you from being in too hard a gear.
Focusing on still being able to accelerate keeps you from being in too easy a gear.
Don't stop pedaling, keep that steady pace