Definately do the project in stages. Work a few panels at a time to keep it managable. Trying to work everywhere around the car at one time will just lead to major stress and sloppy work. There's no time limit when you're after good results. Work a few panels at a time and get them to the first stage of primer surfacer then set them aside and work on two other panels. Keep rotating your focus on the parts untill they are in the final stage of primer, then final sand and paint. Yes, it takes days and days- lots of days to do the job right. My last complete inside and out top to bottom body restoration took over 400 hours.
When all the parts are final sanded and ready for paint your plan has finally come together and the light can be seen at the end of the tunnel. Be persistant and progress will show.