Possums are not aggressive, it won’t hurt you unless you grab it. Put some food out, leave the room for a while, when it comes out charge in and put a laundry basket over it. Then, just scoot it out the door. You need to find out how it got in. If it’s a baby you could have a momma possum in the attic.
If all else fails, and it is not a rat, call the county wildlife rescue folks. What county do you live in? I may have a number to call.
I see the darn thing sticking out of the baseboard and it does looked spooked. The cat is in the kitchen “patrolling” and keeping it scared (Kitchen can be closed off from rest of the house) but might have to try your idea.
Had a possum problem outside last fall. Caught a big one outside with a trap that was provided but I guess another "momma" is back because because this one looks rather small.