Ripping off short strips of tape gives you a wandering line. Press the end in place, keep the roll itself pushed against the surface as you unroll, and set the tape down in small sections — the roll acts as its own straightedge.
Sharp cut-in lines come from a properly loaded soft angled brush, held low and pushed into the wall so the bristles fan out — first a pass a couple millimeters below the ceiling line, then a second pass dragged along it.
The full workflow for a horizontal two-color wall: sand and dust, top color first, a leveled pencil line, delicate-surface tape set just above it — then seal the tape edge with the base color before the second color goes on.
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