390 is north of Chapel Hill. Take 290 west to Chapel Hill, turn right off 290 at the light. Follow road through town to end at tee, approx. 8 to 10 miles. turn left. take road to next tee intersection. turn right. about 1/2 mile look for sign that says "scenic 390", turn left. follow signs. First few miles are straight nothing. you will make a left where indicated to stay on 390 and then the fun begins.
Sorry I cannot give specific road numbers but if you look at a state map you should be able to find the route. 390 will end back on 290 just this side of Roundtop.
As for Liberty, don't know of what you ask.