The short walk to the terminus starts where the Appalachian Trail crosses Forest Service Road 42, 0.9 miles north of the summit. Getting to that crossing is the actual undertaking.
From Blue Ridge the usual line is Aska Road, then Newport Road and Doublehead Gap Road towards Nimblewill, then onto the forest road network. Allow an hour and accept that the last stretch is gravel, single-lane in places, with drop-offs and blind bends. A standard saloon car handles it in dry summer conditions at about fifteen miles an hour. After heavy rain, and through late winter, it can be rutted and greasy, and the Forest Service closes sections of the network seasonally without much warning.
Two practical points. Mobile signal disappears well before the trailhead, so download your route before you leave the cabin rather than relying on a live map. And the parking at the crossing is a widening in the road, not a car park; on a March weekend it fills, and people park along the verge for several hundred yards in both directions.
If the road is closed or your vehicle is not up to it, the honest alternative is the Approach Trail from Amicalola Falls, covered below. It is a different day entirely.