Try the Remodeling Forum for a better chance at getting an answer. They deal with stuff like that frequently.

Lee AKA Fireraven9
Great woods, you frighten me like cathedrals;
You howl like an organ; and our hearts of misery,
Rooms of eternal mourning where quiver ancient rattles,
Answer the echoes of your from the depths I've come to Thee.
- Charles Baudelaire, Obsession

Here is a link that might be useful: Remodeling Forum

I figured this out. I found THIN 1 inch paintbrushes... they don't touch the textured ceiling at all and allow me to make a freehand perfect edge.

Thanks for your help!

Janie