Low-VOC paints dry faster than the older latex formulations, so it's critical that you fix mistakes quickly. That's why a second pair of hands is really helpful; one person can cut in on walls and around trim while the other follows with a roller. Paint in 3-by-3-foot sections, keeping a close watch on your work. The new paints are much thicker, so brush marks will be more noticeable and will need to be leveled right away. If paint beads up at the end of your roller and leaves a trail on your wall, go over it immediately to distribute it evenly.