Haven't done it in awhile, but loved being Fett.
It's been said here, but I'll ditto it.
Move slowly and deliberately unless you have somewhere to go.
Slow head movements. And by slow I mean ^&$%$ slow! (sorry, I love the Onyxia Wipe video).
Practice your poses for when standing still. Either cradle your gun in your left elbow with your right hand over your left (which can be hard to pull off). Or the classic pose from the hallway with the carb block. Hold your gun normally in your right hand, make a fist with your left, and place that first just in front of the trigger area.
When walking, do it briskly, as was mentioned, you know what you're doing and where you're going.
But otherwise keep it slow, and when you move, do it efficiently.
I hate seeing Boba's who fidget with themselves or move their head around a lot.
I know it's unavoidable sometimes, but just be aware of your fidgeting.