First, kill off weeds with a product such as Round-up. For minor weed problems, spot treat problem areas. Aerate compacted soil and spread down a good organic compost. Thatch only if you have a build-up more than inches thick. Some thatch protects grass crowns and conserves moisture.
Extension also offers lawn-care workshops each fall.
Incorporate lime based on a soil test report. Fescue lawns need a pH, or soil acidity, of 6.2-6.5. Fertilize three times before December holidays. In late February or early March, apply pre-emergence control for crabgrass. Avoid mowing your fescue grass too short.