Is that a trail or is it wilderness or is it just "country?"
I have this distorted impression that there aren't a lot of really huge National Forests in that part of the country.
Point is that if you are planning this as a wilderness/forest backpacking trip I'd suggest one kind of approach to it. If this is a walk along country roads between town parks or KOA campgrounds then you have another approach. And if you are "walking for <insert your cause here>" with vehicle support then you have yet another situation.
Getting "out there" is great.
Getting out there without working up to it might not go so well.
Even preliminary gear tests won't tell you everything.
Sea Story Mode ON: Prior to taking my first long cross-country motorcycle trip to celebrate leaving the Navy, I set up my camping rig in the backyard in Va. Beach. It was April. Everything worked great. Tent, sleeping bag, pad, stove.
I rode west toward W. Va. That night I slept in the Blue Ridge in a campground. I was cold. I was cold every night I slept outdoors for the next month except for the campground in Death Valley. oops. I rode most of the trip in all of the clothes I had with me. oops. Got snowed on in New Mexico. oops. Had to stand on the bike pegs to see over the snowbanks while riding in the Sierra Nevada. Hmmm.
(Still had a marvelous trip and a once-in-a-lifetime experience)
Sea Story Mode OFF
i a'm planing to hike not hitchhike cross country about 150 miles . atlanta to the coast of sc.