Reverse parking is a challenge for every learner driver.
There are also many experienced drivers on Australian roads who have never been taught how to reverse park quickly and easily. This causes anxiety and or frustration for both the driver attempting to park, and motorists waiting behind them to get through.
The following video link explains in simple terms the correct method. Practice is essential. Somewhere quiet like a little used cul de sac or dead end street, or a remote corner of a shopping centre car park would be ideal.
If you would like more, or different, instruction, search “reverse park” on YouTube. There are plenty of tutorials online.
If all else fails contact a reputable driving school for a lesson.