Use a phillips head screwdriver to unfasten the two or three screws located on the inside knob plate.
How to change a lock from an original door.
Step by step instructions on how to change a door lock.
Then remove each side s door knob by pulling them away from the door.
If your new lock is the same brand and model as the old one you may be able to keep your existing latch plate and strike plate.
For rekeying the lock cylinder the locksmith must bring the lock to the unlocking position.
Remove the latch assembly doorknob.
Remove the two screws from the latch assembly on the side of the door.
Insert the pins and reassemble the lock.
Remove the strike plate on the door jamb as well.
Once the new pins are in reverse the steps to reassemble the lock.
Remove the screws from the old lock on the inside of the door.
Cylindrical door locks for entry doors are internal keyed locking mechanisms.
An experienced and professional locksmith can pick the lock open or shim the lock for unlocking it.
All you need is a screwdriver and the replacement lock.
You may also need to use a wire tool or a paper clip.
How to change the lock cylinder in an entry door.
It is as simple as changing 3 screws removin.