I want to install pavers in the back yard. Do I need to prepare the ground before laying the pavers ?

If you are placing the pavers over grass or compacted dirt you will want to ensure the surface is flat. You will also want to place a weed barrier under the pavers to keep grass from growing through the flooring surface. If the pavers are being placed on a concrete slab, you will want to ensure the surface is clean of dirt and debris.