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What she doesn’t talk about here is how to avoid paint “bleed” under the tape. With the textured walls and ceilings many of us have here in Florida, it’s difficult to get the tape tight enough (well, it is for me, anyway).
After you put tape along the edges – go over the tape and an inch of the wall with the color of the neighboring surface (i.e. ceiling white next to the ceiling, wall color of the touching wall, etc.)
By going over the tape, the ceiling color will bleed under the tape and form a seal – then, when you go over the wall with the new color, it won’t bleed under.