How to Set a Mouse Trap. Mice are a common problem in many American homes. They range in size from 3 to 14 inches from their pointed snouts to the ends of their long, hairless tails. Mice are hearty pests because they are omnivores--creatures who eat almost any type of food. You can get rid of a mouse by setting a standard trap consisting of a snap bar that kills the mouse by force.
Remove the staple that holds the locking bar in place during shipment. The "locking bar" is the long, metal pin that holds back the spring-loaded, "U"-shaped snap bow.
Add bait inside and on top of the bait pedal--the curled, metal piece opposite the snap bow when the trap is ultimately set. The best bait is a dollop of peanut butter.
Pull the snap bow backwards and hold it securely with your thumb. With the other hand, pull back the locking bar and hook its curved end underneath the "U" or "V"-shaped metal loop sticking out from one end of the trap.
Place the trap perpendicular to a corner wall with the bait pedal facing the wall. Since mice are generally nocturnal, it's best to set the trap in the evening and leave it overnight.
Wait for the trap to go off and then check it for a mouse. If there is a dead mouse in your trap, remove it using thick, protective gloves. Discard of the mouse in a doubled-up plastic bag ultimately put in an outdoor garbage can. Reset the trap if necessary.