Use the flat end of a spudger to disconnect the left fan connector from the logic board.
It is useful to twist the spudger axially from beneath the fan cable wires to release the connector.
The fan socket and the fan connector can be seen in the second and third pictures. Be careful not to break the plastic fan socket off the logic board as you use your spudger to lift the fan connector straight up and out of its socket.
The layout of the logic board shown in the second picture may look slightly different than your machine but the fan socket is the same.
Use the flat end of a spudger to peel up the edge of the large piece of black tape covering the trackpad cable.
Peel the tape up and fold it back out of the way of the trackpad cable. Leaving it in place on the upper case will make it easier to reapply it during reassembly.
When reinstalling the trackpad, loosely replace the four Phillips screws and check the alignment of the trackpad on the keyboard side of the upper case.
Once you have centered the trackpad in the upper case, tighten the Phillips screws all the way.
Use the large Tri-point screw at the bottom of the trackpad to adjust the click stroke.