I've found that facing champions like Akali, Leblanc, Zed, its really easy to get that first kill once you've pushed them to their tower. As long as you poked them down efficiently and not totally E'd every minion wave possible, you should be able to land a Flash-E-Ignite and then walk away as they burn to death at around 3:40. All you have to do then is play your advantage and play passively. But other than my slight qualm with the idea of not pushing even slightly for kills I've found that this guide really helped! Thanks!