I already knew how to change vectors after firing. The morays, however, weren't so bright. After losing roughly three missiles to moray guns, I figured out that I needed to either stop using missiles altogether (which is a big step away from pussy-dom) or fire and then move to distract his aim.
Generally, I don't use missiles unless I'm in a jam. Those are rare, unless I'm in a Shrike. I hate Shrikes. I can beat any mission in a shrike, which is the sign of a good pilot, but I still hate the damn things. Too many drawbacks. They remind me of Crossbows. I'd rather strap a torp on a ferret. Those bugs would be damned hard-pressed to touch me, then.