Should I quit my job to focus on training?
No. See this video for a detailed explanation. https://youtu.be/K7pVZLLyRjM
I'm a female trying to go PJ, what areas should I focus on training wise?
Start rucking a lot. Get very comfortable wit 60 lbs on your back. Also focus on load bearing activities (i.e Farmer carries, Buddy carries, Training aids)