You said that you have to be 80-85 to get heirlooms. On my first char ever (undead rogue) i played a lot of random battlegrounds and i got the pvp shoulders. It takes time but it was totally worth it :D. And btw great guide.
You can smooth the hard edges of a selection by feathering. Feathering blurs edges by building a transition between the selection and surrounding pixels. This blurring can cause some loss of detail at the edge of the selection.
Apply your first coat of white paint over the trim with a narrow brush. Begin at the top or end corners of the trim and paint the edges where the trim meets the wall first, and then move to the center. Paint small sections of about one foot long at a time and maintain a wet edge to avoid lap marks.