With one hand, firmly secure your device.

With your free hand, lift the bottom edge of the motherboard and pull it towards the bottom of the chassis to remove it.

With one hand, lift the top edge of your device so the actions buttons and D-Pad aren't touching your work surface.

Visually check that all the buttons are fully and properly in their recesses. If they aren't, they won't press correctly.

With your device lifted, use your free hand to slide the motherboard into place at a slight downward angle.