I hiked a fair amount in the area of The Sequoia National Park. The risk in the parts of California that was always present, is the presence of Brown Bears. When camping for the night, be sure your food is well up out of reach of the bears. One of the solo hikers I had spent some time with, was hiking with a pack thet had been clawed open one night. Every speck of food was gone. The bear even consumed the saline he had with him for his contact lenses. I was forever on the lookout for bear signs, with my head on a swivel constantly.
The parts of California I have hiked in were just beautiful. Some of the trails are rather arid, so pay attention to your water supply. Some of the trail is pretty elevated, so be ready for some climbing. I hope you have and enjoyable trek. I'd like to know your thoughts about PCT-v-AT.