This video describes the easy process of building a garden retaining wall. First you will need to map out your area for your wall with strings and dig your trench for your stones. You will be filling the trench with gravel to hold your stones in place. Make sure to pack to gravel securely into the ground. You should have a leveling tool to ensure your base is very level. After you make sure that first level is secure and in place you will stack your next level of stone. Once the homeowner has read up on the process it is a simple weekend project to complete.