Unlock and open the door.
Extract the two screws in the striker plate on the edge of the door, using the screwdriver.
Take out the screws on the handle plates or round knob trim on the side of the door facing inside.
Pull off the handle from the front of the door. if removing a doorknob assembly, grip the knob on each side of the door and pull straight back to disengage the two halves.
Slide out the door catch assembly on the edge of the door.
Insert the new catch assembly into the opening on the edge of the door. Push firmly to seat the part in the round opening for the doorknobs.
Insert the locking side of the door handle through the opening in the front side of the door.
Place the knob assembly on the inside of the door through the hole and into the catch assembly. Turn the knob so the two rods align and insert into the female rods on the front handle or knob.
Secure the handle or knob with the supplied screws through the holes on the mounting plate or round trim for the interior side of the door. Tighten with a screwdriver.
Place the rectangular striker plate over the latch assembly in the edge of the door and secure with two screws.