Chevrolet 2010 HHR Owner's Manual page 144

Press the clutch pedal as you let up on the
accelerator pedal and shift into 2 (Second). Then, slowly
let up on the clutch pedal as you press the accelerator
pedal.
4 (Fourth) and 5 (Fifth) the same way you do for
2 (Second). Slowly let up on the clutch pedal as
you press the accelerator pedal down.
To stop, let up on the accelerator pedal and press the
brake pedal. Just before the vehicle stops, press
the clutch pedal and the brake pedal, and shift to
N (Neutral).
Use this position when you start or idle the
engine.
To back up, press down the clutch pedal
and shift into R (Reverse).
For SS models, lift upwards on the ring located on the
underside of the shift knob to shift into R (Reverse).
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Shift into 3 (Third),
Also, use R (Reverse), along with the parking brake, for
parking the vehicle.
If you skip a gear when you downshift, you could
lose control of the vehicle. You could injure
yourself or others. Do not shift down more than
one gear at a time when you downshift.