Help getting rid of a mice
You are better off with a piece of cheese - also traps that capture are better than the slam and decapitate. I never had any luck with peanut butter - cheese works well.

1: Do you live in an Apartment or a Separate residence?

If Apartment , Town home or Condo the issue is that you could have an entry way from one unit to the other that you will need to close off - I had an apartment and behind the stove where the power cord was there was a hole in the wall .. I taped it up and no more mouse.

2: You will need to clean the home thoroughly looking for anything and everything that the mouse can get into for food - including open boxes of cereal in the pantry.

You can nickname the mouse and it might help with you being terrified - yes a bit light - hearted .