Draw a line with your 6 in one tool between the ceiling and wall. Simple as pie to cut in to that line.
After washing your brush, return it to the package or wrap it in paper towels to hold the original shape. I saw 3 brushes bent 30degrees today. Ugh.
The truth is you're the weak. And I'm the tyranny of evil men. But I'm tryin', Ringo. I'm tryin' real hard to be the shepherd.