No matter what we do, it will never be effective, unless there is already a certain amount of doubt within the JW at your door. This illusion we can "wake up" a JW is just that, an illusion. Don't forget, they have a scenario for anything that might happen at the door.
Hostility = persecution, and Jesus said they would be persecuted in his name, although the name of the people at your door are actually JEHOVAH'S WITNESSES. So totally invalidating their argument, however, they will not be able to grasp this fact.
Not interested = why?/apposed/you just don't know until you try, hence the repeated return calls.
Their now defunct manual. "Reasoning from the Scripture's" has just about every answer to use on the unsuspecting householder. However, this book no longer has the effect it once had, hence the reason it has be discontinued. Also, it has "old light."
Don't forget. As a JW, they are trained to sniff out (or snuff out 😉) those who are "apposed" to the "good news." Most JW's can spot and exJW from a mile away.
Best thing anyone can do is smile, thank them, and politely tell them that your not interested. If they persist, then slowly close the door whilst still being polite. This will be far more affective than being met with hostility.