While creating the gap between the Macbook and the back panel, insert an opening pick into the gap about 0.2in.

Don't insert the pick further, as this could cause internal damage

Move the pick towards the left side of the Macbook and around the corner edge.

Bring the pick up towards the top of the Macbook

Once you reach about the middle of the Macbook, you should hear a click. This is good! You have now unhooked part of the back panel.