Here are some reference points and advice to help you master the left reverse.
Adjust the door mirror so that you can see all of the front door handle and it is just above the bottom of the mirror.
Notice that you can see a length of straight kerb next to the car and going back towards the corner.
Reverse slowly towards the corner.
When you can no longer see the straight edge of the kerb, STOP and turn the steering wheel ¾ turn to the left. Do not go so far back that you cannot see the kerb at all.
Keep the ¾ turn on until the back of the car appears this close to the kerb. At this point you are in danger of reversing into the kerb!
STOP and straighten the wheels.
Check all around and reverse slowly a short distance until the door handle appears to be next to the closest part of the kerb to car.
STOP again and steer ¾ turn to the left again.
Check all around once more and continue reversing slowly.
When your car is parallel to the kerb (as shown in this picture), straighten your wheels and reverse three or four car lengths into the new road.
Things To Look Out For . . .
ALWAYS keep a gap between the kerb and the car !
In this image, there is no gap and that makes it more difficult to avoid hitting the kerb. Keep watching the mirror to make sure you don't allow this situation to occur.
ALWAYS make sure you can see the kerb in the mirror !
If the kerb disappears from the mirror, you are too far away. Steer an extra ¼ turn to the left to bring the kerb back on to the mirror.
Steering more to the left like this will bring the car to the kerb much more quickly than usual so keep watching to make sure you don't get the problem in the previous image.
Make sure you are parallel with the kerb !
Sometimes, it looks as if you are parallel with the kerb when you are not. You can see in this image that if you were to straighten the wheels at this point, the car would start to go across the road.
Take care to make sure that the car is actually parallel with (or pointing very slightly towards) the kerb before straightening your wheels. You WILL notice if the car starts to get quite close to the kerb. You WILL NOT notice if the car is staring to go wide from the kerb.