Take out the first gang easily
Okay when you start the game go to the Shi Gen area (Island 3) and kill a few gang members eventually you should come across a gang member with a heat seeking rocket launcher, kill him and take it. This will make taking out the first gang much easier as they do not ahve any long range explosives they only have grenades. Also make sure you go to a save point with it so that it is stored there for use whenever you need it.
Hope this helps
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