Identify headshell by opening the turntable dustcover.
Remove stylus from cartridge.
Do not pull aggressively as to break the plastic.
Turn tonearm nut toward you to release headshell from the tonearm.
Remove screws with phillips screwdriver #0 to release the cartridge.
Use standard turntable head screws found at a local audio shop if missing
Unplug wires from pins.
Replace with new cartridge
Plug pins in reverse from removal
Pay attention to matching the colors from wire to pin
Screw cartridge in in the same way it was removed.
Insert new stylus into cartridge before mounting headshell
Screw assembled headshell onto tonearm.
Test new needle and allow for a break-in period.