On many of my properties, I just run the trimmer along the walks and driveway edges at an angled position, but some customers ask me to edge it more vertically, It does look better vertically, but on some yards, it doesnt. Most people do not care as long as it is at least done, but others are particular about it? Plus I always wonder if it is really good to run a trimmer upside down? And for some reason, I have to walk backwards to edge it properly! Ive tried walking forward doing it and it turns out looking bad? Just wondering which way other guys are doing it.