take some duct tape and tape a square around you. funny how well it works. when people get too close point to the square- they think you are official.
i was just going to post something along these same lines. when you are the only taper, saying that you are the "house archivist" usually keeps the stupid fockers away from you. or if you have a t-shirt of the band you are taping they think you are a part of their crew and are recording for the band. the second they figure out you are a hobby taper, taping for yourself is when their care for your space and what are doing diminishes to nothing.
If you wanna do the "house archivist" route, go full-bore and look the part - flashlight, Leatherman holster, black shirt or "crew/staff" shirt, walkie-talkie (even better if you've got one with a mouthpiece that you can clip up near your shoulder), lanyard with laminates...go nuts.
That stun-gun looks frighteningly easy to activate. With the amount of crap your average woman carries in her purse, that thing would go off WAY too easily with just a rocker switch on it!