Get a licensed removal agent ... If that thing is rabid you want no part of it ...
I’ve had two encounters. The first shot usually is a miss. It will leave big holes in whatever gets in the way.
If you decide to adopt him, he will need four different shoes.
I used to plaay possum when my ex-wife was haranguing me, but that experience did me no good and I doubt it has lessons for you.
Move....
I trap them with cage traps. Very easy. Take far away, or clean and cook.
Not a possum, but squirrels. We threw bits of waffle to the animal and step-by-step led them out.
I was reading just last night that possums rarely carry rabies. But all the same, it is a slight possibility and they could easily chew through wiring.
Get a gun and shoot the little f88ker.
Fix the holes later.
THEY ARE NOCTURNAL ANIMALS so it will be most active at night and would be the best time to catch her. They will eat just about anything. Maybe use something smelly like salmon.. A little bit of fruit like banana or something..
They can be VERY mean, lots of razor sharp teeth. Or startle it and it will pass out and play dead.
NOTE: If it's a she with babies the good news is, she take the babies with her wherever she goes!
Call the professionals, even if you have to call one from a few counties away. They know how to remove them with the least amount of damage to your abode and keeping the critter(s) alive to be moved to a location for release. Win-win all the way around.
You ain’t got a 357 Mag?
Nuke it from space. It’s the only way to be sure.
Garlic......or ammonia..... If any way to lower it into the walls
Stinky Mothballs in the entry ways? This is no good if you have to smell the mothballs though, because the gas is poison. I used it for bats and squirrels and it worked. Then I plugged the points of access.
They aren't actually much of a rabies risk, because their basal body temperature is so low it's not a good host for the virus. They aren't cuddly, of course, but they are rather cool. I'd set out a live trap, at night, full of trail mix.
....or play rap music 24/7
Find where they come and go from
Get a Duke #1 or equivalent
Put trap right where they come and go from as near to the entrance to the wall as possible
Bait with peanut butter and bacon wrapped on the trigger plate
Tie off or chain to something or nail it
You’ll get one of them and it’ll drive them off
You’ll find a pawless critter or a dead one if you got the head
Handle with a stick or grabber and dispose in case of hydrophobia
However remote the chance
This is how I’ve done it with coons and possums and even squirrel
I had a three legged coon on my property for years but they stayed out of my horse food and chimney crawl space after that
Seriously though, if you live in a city call animal control and see if they will come and trap it for you.
If not, either call an exterminator to trap and remove it or get a catch them alive cage trap from Home Depot or Tractor Supply. Make sure the trap is large enough for an opossum. They also sell small traps for rats and other varments.
Whatever you do don’t put out rat poison or you may have a rotting carcass in your wall stinking up your house for a couple of weeks.