Research the specific regulations for building a fence in Gwinnett County. Go online and pull up the county requirements for Fences and Walls. (http://www.gwinnettcounty.com/static/departments/planning/pdf/fences_&_walls.pdf). Use this as a resource when planning the new fence.
Measure and record each side of the fence exactly where the fence will be built. Create a schematic map by drawing the fence on a piece of paper complete with measurements.
Visit a store that sells wood for fences. Ask a sales associate to compile a materials list from the schematic map. Purchase the materials and schedule a delivery.
Identify where to set the 4-by-4 posts. Draw a string line between two stakes to guide where the post holes will be marked. Using marking paint and a measuring tape, spray a mark every 7 feet, 9 inches. This is where the post holes will be dug.
Use a regular set of post-hole diggers to dig a hole at each mark. Make sure each hole is 12 to 18 inches deep and 4 to 6 inches wide.
Mix each bag of concrete with water and a masons hoe in a wheelbarrow. Set each 4-by-4 post in the post hole perfectly vertical about an eighth of an inch from the string line. Fill the hole with concrete around the post. Before moving on, recheck the post to make sure it is still perfectly vertical and about an eighth of an inch from the string line. Let the concrete dry per the instructions.
Measure and mark each corner post at 10 inches and 32 inches from the ground. Holding a chalk line on each corner post at these marks, snap a line to mark all the posts in between. Each post is now marked for attaching the railings.
Hold each 2-by-4 between the posts at the chalk line markings. Mark where the 2-by-4 needs to be cut so it will fit between the posts. Cut each 2-by-4 at the marks and fasten them between the two posts using a framing nail gun.
Nail each picket onto the rails with the siding nail gun. Use an extra picket as a spacer to keep the space in between the pickets consistent.