The first tier of your fire pit is the most important. Create your first tier by forming a circle, alternating the large and mini bricks to create a pattern. Using your level, make sure the bricks are relatively even all of the way around. If the circle is more than an inch or two uneven, remove the higher bricks and dig out the dirt underneath them until they are level with the other side. This is an important step to insure your fire pit is level before building the additional tiers.