I would read the article and watch the video before attempting this project and have them easily available while you are working. There is nothing that you are likely to come up against that isn’t covered.
The Repair

    Mentally insert the word carefully in great big letters before each of these directions!
    Remove battery
    Remove the three screws at the base of the camera that surround the tripod mount thread.
    Remove the two screws visible on each side of the camera (four screws in total).
    Remove the side plates
    Remove the back cover very carefully so as not to damage the ribbon that attaches it to the main body
    Remove three screws from outside of the chrome metal shield plate (not the inner ones).
    Remove shield plate.
    Remove three screws securing (back of) sensor plate (the ones that were visible through the metal shield plate).
    Lift plate very carefully and fire several bursts of air.
    Reverse the above to reassemble the camera.