blue painters' tape
Line the top edge of the painters' tape along the bottom edge of the base board.
Tuck the edge of the painters tape under the base board using the flat tool. Make sure about a 1/4" of the tape is under the base board so paint does not find its way onto the carpet.
Paint away! I found it helped if I loaded my brush and started painting in the middle of the base board rather than at the bottom along the paint. That way I could spread out the paint and control it close to the carpet.
What painting projects are you working on?
Happy painting everyone!