The first step is to choose the pivot. The pivot is often the first, middle, or last element in the list. In this case, our pivot is the last element: three. 

Rearrange the list, swapping each element with regard to the pivot, ensuring all elements to the left are smaller than the pivot, and all elements to the right are larger than the pivot. Now, the pivot is correctly placed in the list.

Use recursion to complete the process with each subarray. In this case, we now have two subarrays. We can repeat steps 1 and 2 with the elements 1 and 6.