Over the last 5 or so years I have built so many patios its untrue. Patios are costly so need to be done right the first time. Particular attention needs to be paid to the foundations, any damp courses, levels and the fall of rainwater and to where it eventually goes.
The final attention to detail is in the pointing as this can be the difference between something average and something spectacular (we work to the spectacular side which takes a little longer and makes all the difference). The design and patio layout are also critical when next to a house.
I have attached several pictures showing different types of stone and layouts