As a former professional painter, something that drives me crazy is when I see painters cut in around wall plates. First of all, the amount of time that it takes to cut in is usually much longer than the amount of time that it takes to simply remove the wall plate. Secondly it does not look nearly as clean as it does when the wall plate is removed and thirdly it can invariably leave paint on the wall plate itself which also looks sloppy. Make sure the painter takes them off and then reinstalls them. It's less time.
Most interior painting projects will present corners and edges. Corners, trims, splashes and accents will require cutting in — which generally requires the most patience, preparation and skill. There is a lot of debate among painters whether it is better to cut in before or after applying the roller. Solo painters may want to prepare the surfaces first, apply painter’s tape where required and cut in before applying paint to the rollers. Painters working in teams can split cutting in duties in sections while other team members are applying paint with rollers.