Many approaches are possible, I’ll describe the approach from Bishops Waltham.
From the big roundabout in BW take the B3035 towards Corehampton. After about 3 miles the road widens out to facilitate right turns. Take second left, at a solitary red posting box up Beacon Hill Lane towards Kilmeston. This is mostly a single track road, drive carefully.
After 2 miles, ignoring all minor turns to left and right, reach a skewed crossroads and continue ahead over the main road towards Kilmeston.
After 0.3 miles the destination barns are seen through trees on the left. Enter through a double iron field gate and park neatly.