Car reversing

If this is what you see in the reversing mirror then things are perfect. Just make sure the steering wheel is in the symmetrical position like the view below and move slowly and steadily backwards.

If not then centre the steering wheel and creep very slowly backwards while correcting the image in the mirror to the one desired by moving the steering wheel. The movements needed are small ones comparable to those you make while getting the car centred in your lane on a motorway. Big movements similar to supermarket parking are not needed.