I agree with dunc, they are fragile little darlings, and more scared of you than you will be them, you should see the way their little hearts pound if someone tries to corner them. I have two as pets and not nervous with mum or i but we have doormice that visit our backyard that play on the wall they get frightened very easily by most things.
Just dont let anyone kill it, if you want rid of it please try some friendly methods even though i appreciate your scared, ive found bribing them with a chocolate button helps lol im being so serious as well.