First I would make sure the two assembly screws are snug or tight. They will work loose over time?
You can find the exact door handle model at Home Depot, ace, or lowes most likely for around $20 bucks depending on your model. Basically you have two screws on the side of the door and two screws holding the door knob assy. Togather. The door knob kits comes with instructions and two keys. The hardest part will be getting the screws started holding the door knob togather. Just note how it comes apart and assemble inreverse order, an adjustment my have to be made if misalign it slightly when tighten up the assembly screws, Just loosen the screws up enough to move the two half for better alignment.
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