5. Yes you can tweeze above the brow.
My rule of thumb: If the hair is not touching the brow in any way, there’s no way you can mess up the brow shape. Simple as that. You’re actually tweezing hairs from the forehead and temple, not the brow. But once you actually next to the brow, that’s another story. Taking too much off the top of the brow can result in holes and uneven brows, making 1 brow seem higher than the other. So leave the actual shaping to your brow specialist. But cleaning up between visits for the strays is fine, as long as the hair is not touching the brow.