My attic is a dark, cramped space with no windows and a ton of insulation. What kind of attic do you have where someone living up there can see and hear everything that happens in the main living space?

Or rather, what have you done to think that someone with a complete dossier on you has resorted to occupying your attic in order to get the jump on you?

These days if you find someone living in your attic then it's most likely a drifter looking for shelter. Better to find a man down on his luck than a large colony of pests.

Probably not, if they're living in the attic they are still a threat, but likely not an economically sound threat. I probably have the advantage in that regard, they'd need like 7k in gear and some training to be better prepared. They'll also never have access to the safe, nor the one on me, they'll have to bring their own.

If they're just in there hiding Richard Ramirez style, then it doesn't matter who is better armed, it is time to roll them dice. Frankly it's always a dice roll, I've seen a literal parishioner with a handgun take out a better armed dude with a 45yd (estimate) shot because the better armed mass shooter wasn't as good of a shot and hadn't learned his weapon properly (thankfully). What you carry matters less than getting shots on medically significant parts of your target quickly, you want to hit first and hit an area that is important, regardless of caliber, you could beat a guy with a .50cal with a .22lr, if he misses and you don't. Of course, that said, you have a higher liklihood of one of those bullets hitting a medically significant target the bigger it is and the wound channels will be different, and depending on armor which the guy in the attic likely has none of you may need the small fast bois to punch through it, but I'd take my chances.

The real issue is he has the high ground and a choke point, so if he did bring a gun that'd present the most problems. Of course, he's gotta come out sometime, and then it becomes my choke point. I suppose the real question becomes how did I discover he was there? Did I see him? Hear him banging around? Were the bangs as such that I'd go investigate myself or would I potentially involve law enforcement? All that makes a difference in the scenario. If I walk into my attic and theres just a guy up there who has the drop on me that is a kobayashi maru, but if I go up and he has a contact weapon like a bat or knife, I have the distance advantage. If I hear him up there and know it is a person somehow not just like a mouse, the cops are just getting called, I'll outsource. If I hear him and think it may be a mouse and I go to investigate, we're back to "does he have the drop on me or do I have the distance advantage."

Still, in any case, the guy will be easier to deal with than the roaches. Less time, less money, and maybe he has a gun but maybe not and maybe it doesn't matter if he does.