questions about right after paint is laid

I would try to paint from inside out too. The thinest, least expensive sheeting found in the paint dept of Lowes etc.. will work. Low tack tape is a must !
proper surface prep is the key. if an area is not sanded and preped right, a day or a year wait wont matter. The tape might still lift the paint. Saw this happen area just below the door glass, when pin stripe was added over body color. Paint had been on 2 weeks and the tape wasn't there 2 hours.