Just wait and fight as you would and then if you come across a stack of boxes when aiming at carlito don't move instead press Y in front of the stack of boxes and when you are on top keep walking on the top to the balcony you can follow him here without having to fight him on the ground and if you fall do this cheat again.

WARNING: He can kick when you are on top if you are close to him, it takes more health off you than his gun if you have the right weapons with you you can beat him on top like a
base-ball bat, claever from jills sandwiches, guitar, sledgehammer from on top of shelf in the warehouse and any garden tools from ouside in the park or a gun if you want if you can get a katana in time then get it.