First attempt to thru hike the AT. Looking at starting July 19 or Aug 1rst. Will two weeks make a big difference and can I carry a 20 degree bag the whole way? What kind-of winter clothing do I need down South and when? I'm a Southern girl, not partial to cold, wet weather. I'm extremely allergic to mosquitos and chiggers and poison ivey so I want to start later to avoid the nasties. I would greatly appreciate any shared wisdom. I'm a hammock camper, btw and ultralight. Lastly- Boots or Trail runners? Have ankle and knee injury issues. I've always worn boots but trail shoes seem to be the norm now. however- I'll be in Fall/Winter weather.