When working with electronics, it's important to choose a tool that's ESD-safe to avoid accidental damage to the device. The metal spudger is great when you need serious prying power, but the regular black nylon spudger or a plastic opening tool should be used whenever possible.

Pry on the seam as shown with a Spudger, in order to get the top casing loose.

Pull the two sides apart while making sure the side that you are removing is the one with all of the case screw holes.

It is good practice to remove the top connection of the battery as shown in the third image, as this will be the first step to replacing any of the components for this screwdriver.