Mostly I agree with Luke.
I think the whole door knocking thing is a royal pain, my lady really hates it. I sometimes enjoy the JW visits but then I am a bit odd. Most folks hate it.
If you feel it’s a good idea, let people you’re going to do it. Put something in the paper, maybe a few times (local rag) so that folks are warned/ prepared. Let em know why you’re doing it. (eg: invite people to s service/ function. help the lonely, reach young mums.... whatever)
Feedback later in the same rag (or local radio) why it was good to do, what the results were, how welcoming the town was etc.
If you can, make sure there are pics of the door knockers so that folks aren’t hiding behind sofas from suspected JW’s.
If you let them know about the process all the way through and don’t do it all the time then they are more likely to understand the process as being local people in a local church doing stuff for local people...as opposed to JW’s who are strange local people doing stuff for that odd mob who don’t do blood transfusions.