Here's some before and after pictures even though they are two different doors.
Before

After
After
The Den after painting.
The trick we learned from Pastor Jerry made our job so much easier. All we had to do was tape the ceiling off. Our tape is actually on the ceiling. Then, we used caulk to run a line along the side of the tape that is touching the wall that is being painted. Next, Cliff smeared the caulk along the tape. This created a seal that prevented the paint from seeping through and onto the ceiling. When he peeled the tape off...we had a perfect line and ceiling did not get painted!