From Weakley Hollow (the main Park Service entrance), hike the Ridge Trail. After dropping into the prominent notch after the first rocky section of the trail, turn left (southeast) and walk (no trail) down the gully about 500 feet (10-15 minutes). This access is easiest in the fall through early spring. On your right as you walk down is a series of small rock boulders and cliffs. Brian's Wall is a steep north-facing wall at the lower end of these cliffs (elevation 2,327'). The location marked on the map here is accurate. Reachable in 1.5 hours from trailhead.