Taking measurements to select appropriate door lock set:
Firstly make sure that you have got a suitable door lock set for your door. In order to get the right one, take a measuring tape and fix it above the door handle with the holding edge on the door's edge and measure till the middle of the door handle. Read the measurements and note them down in your note pad and select the new door lock set according to these measurements.
Removing the old lock set assembly:
Now take out the door knob and deadbolt cover with the help of a screw driver. After this you may find the door latch barrel and the deadbolt assembly popping out, so take them out too.
Installing the new lock set:
Next, install the new lock set. So first position the strike plate on the door, screw in the screws on all sides of it with the help of a screw driver. Insert the deadbolt in the upper slot and secure it with screws. Cover it with the strike plate and attach it with screws.
Installing the door knobs:
Finally install the door handles by carefully holding the two sides of the handle with your hands in order to bring the holes into line. Don't forget to position the locking side of the door handle on the outer side of the door. Next fix and screw in the plate and locate the screw barrels exactly in the screw slots in the deadbolt assembly and screw it in. Also cover it with the deadbolt plate.
The door lock set has now been replaced successfully, Don't forget to check the new door lock set if its working fine.