This build requires you to emphasize life steal through the early game. This enables you to never have to b if you are solo mid lane and if you are laning with a partner will make you much less squishy. Also, you should be constantly harassing with whatever lane you are in. By level 3 you should have harassed some1 down to extremely low health or hopefully, if your laning partner is decent, get a kill. If you start getting fed aim to get your bloodthirster by 10 minutes. If you do. You will easily be able to kill anyone on their team with no effort. You will also have a little more survivability because of the boots and the life steal. But if you are stunned most likely you will die. If necessary use your ulti to stun them and gtfoutta there.