I have found a much better way to pass "Four Iron" mission without having to get involved in a fight. Generally what people do is that they go upstairs to kill that guy and his bodyguards gets into our way, so here is a very easy way to kill him. No cheats required!!
Avery Mission #1 Four Iron
Avery Mission #2 Demolition Man
Malibu Club Mission #3 The Driver
Also i will share some of my best strategies to pass various missions easily in this thread.