The two trailheads are described on the forest service site as such:
How to get here:
FT 12 Trailhead: from Potosi, MO, take Hwy 21 South 18 miles to Hwy 32. Take Hwy 32 West 8 miles to Hwy A. Take Hwy A South approx 1/4 mile to first Forest Road SE Go approx 1/4 mile SE to site.
Hwy A Trailhead: from Potosi, take Hwy 8 one mile East to Hwy 21. Go South on Hwy 21 for 11 miles. Or take Hwy 21 South for 17 miles to Hwy 32. Take Hwy 32 West for 8 miles to Hwy A. Take Hwy A approx 5 miles South to site.
We are meeting at the latter. The "Hwy A Trailhead". It's a small parking lot right on the hwy.
Here's the google map I posted before in case anyone missed it:
http://goo.gl/maps/z83A8
We're almost there!