Turning Granny

Remember that to tie a reef knot, it's 'left over right, right over left' and for a granny knot, it's 'left over right, left over right'.
It might help to make two granny knots and two reef knots. Then you can compare the reef knot in its starting position to the second reef knot once you have turned it.
Alternatively, you could try sketching the knot after each different turn and compare them that way.