Introduction
This guide will show you how to replace your old indoor doorknob and assemble a new doorknob. You will need a Phillips head screwdriver as well as a new indoor doorknob set. Both can be bought from any hardware store.
Tools
Parts
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            Parts: (in order from left to right) 
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            Short Screws 
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            Latch mechanism with latch face 
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            Long screws 
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            Door knob with peg and screw holes (inside of the room) 
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            Door knob with screw holes (outside of the room) 
 
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            Face the inside of the knob, you should see two Phillips head screws on either side of the central knob. 
 
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            You will see the latch face plate (the rectangular piece of metal) where the latch of the door knob is located. 
 
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            Insert the door knob that goes on the inside of the room, aligning the peg and screw holes with the threaded cylinders of the latch mechanism. 
 
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            Align the door knob that goes on the outside of the room, aligning the peg and screw holes with the threaded cylinders of the latch mechanism. 
 
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To put the old door knob back on or to change to a different door knob repeat steps from the beginning.