Should I paint the skirting boards and door frames or the wall first?

Start by painting the walls, then the skirting boards and door frames. However, you should paint the cornices at the same time as you paint the ceiling to get a better and more uniform result. If you’re going to wallpaper, it’s a good idea to paint the skirting boards first, so you don’t have to worry about any paint stains on the wall. See how to do it here: Paint a trim – how to, step by step