A salient fact you seem to have omitted in your original story.
Irrespective, call the cops and stay out of their way. Unless an assassin, it's far more likely they're interested in your new TV than in shooting you.
My dog is awesome for keeping dipshits away, his bark sounds mean. As to protection, I keep a couple of heavy Maglites next to the bed... anyone annoys me, a quick squirt of light to disorient/blind, then beat **** out of them with it