A great lawn starts with great soil!
A best practice is to have your soil tested about every 3-5 years, and the Forsyth County Extension office actually offers free soil testing for individual homeowners. The test will tell you what nutrients you need to add to improve your soil, and to customize micro-zones for individual plants. Never over-apply or use a product that is not needed (We most often see this with lime!).
Or, if you prefer, let us do the work for you. Typical results take about 3 - 4 weeks, so make sure you give yourself plenty of time!