Gather a case back opener, a small flat tool, or a rubber ball
Identify the type of watch back
For a snap-off back, find the small lip or notch on the edge
Insert the tool into the notch and gently pry upward
For a screw-down back, use a case back wrench or rubber ball
Turn the back counterclockwise to loosen it
For a back held by screws, remove each screw with the correct screwdriver
Keep the screws in a safe place
Lift the back off carefully
Avoid scratching the case or damaging the gasket
If the back does not move, stop and use the proper tool
Reinstall the back by pressing or screwing it back into place securely