How ever tall you wish for your center of the staircase spiral to be place it down first.
Place a slab at the floor and than a block next to the slab. As you go up you will not need to hop just walk up.
Continue this patter of block and slab until you reach the top of your creation.
As you look in the picture notice how the slab is just a half block above the block. This way you can tell if you are doing the correct pattern.
Finally as you reach the top your staircase is done.