Step 1: Remove the old handle and dead latch
First loosen the screws on the knob face of the lockset. Once the screws on each side are removed, the entire assembly will come out. On the edge of the door, remove the screws that hold the dead latch. Be careful as you remove it to notice which way it faces as it goes in.
Undo the screws and remove the entire lockset assembly.
Step 2: Insert the dead latch and lock assembly
If you replace your lockset with one that is the same size, you will reverse the steps by inserting the deadlatch first, facing the same direction as the original deadlatch, and screwing it in place. Then insert the two halves of the lockset and screw them in place.
Replace the two halves of the lockset and tighten the screws.
Step 3: Replace the striker plate
Check to see if the new striker plate is the same size as the old one. Take out the screws and remove the old striker plate. Position the holes for the new striker plate over the existing holes and screw it in place. If the new striker plate is larger, make the opening larger by cutting away at the top and bottom of the opening using a utility knife.
Center the new striker plate over the existing holes and insert the screws.