Use the iFixit opening tool to get between the keyboard bezel and the outer edge of the laptop.

There are several clips on all sides that will need to be released. You'll hear and feel a pop as each clip is released.

Move the opening tool or spudger around the perimeter until you unclipped the keyboard on all sides.

This will require a little force. The only thing you don't want to do is push the spudger too deep under the keyboard. You could damage the internals if you do.