What do I need to know before replacing the hard drive?

Before removing the hard drive, shut down the computer, disconnect all external devices and power source, and remove the service door, battery, and solid-state drive. Then loosen 4 P1 captive screws or M2.0x8L P1 screws and pull the plastic tab to release the drive. (Pages 39-40)

From the official HP Probook 650 G2 Notebook PC manual, page 39

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