The screw on this mouse is a #2 phillips.
To take off the top part, you will want to lift the cover up just by a centimeter or two, and then slide it towards the back of the mouse while pulling up.
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Do not pull by the wires! If you do, you better be pretty good at soldering.
You can use a non security torx bit if you break off the little pin in the middle, be careful not to damage the rest of the screw.
As long as you don’t exceed the couple tons you need to take it off you should be able to put it back.
Start prying the side plate off underneath the trigger, this makes it easier to disconnect the other clips connecting the side plate to the backplate.
This model of the xbox one controller does not feature a 3.5mm headphone jack. Please look at the guides for later models of the xbox one controller.