Figure out where in your yard you would like to build the barbecue pit. Make sure it is far away from brushes, trees or other fire hazards. Use metal grill grates as a guide to determine the size and placement of the brick or garden pavers. Mark the area where you plan to build, and dig a pit 8 inches deep. Use tamper to level and compact the ground. Add gravel to a height of about 2- 3 inches then compact and level with tamper. Mix fast-drying cement according to manufacturer’s directions. Pour on top of gravel until the hole is filled to ground level. Smooth and level the cement pad using a trowel. Allow cement to cure for 24-48 hours. Put the cinder blocks on the edges of the mortar, leaving a small hole or two to drain water. Use the leveler to make sure the cinder blocks are even, and use the carpenter’s square to check all of your corners if you are building a square pit. Spread mortar on top of your cinder blocks, and place bricks, or garden pavers over them. The double layer of bricks strengthens the structure. Keep adding bricks, or garden pavers and mortar until you reach the desired height for your barbecue pit. Put metal braces in the last layer of mortar while it’s still wet. The braces will hold the grill top.