The Torx-T8 is unnecessary; eliminate step 8 and 9 unless you explicitly haven't yet changed the thermal interface material on your processor.
Removing the phillips-head screw in the area of the heatsink above the modem card (The yellow-circled screw in step 8's photo) and then lifting the plastic tab on the processor as shown in step 10, while sliding the processor slightly to the right, will permit a clean removal. Reverse procedure is to slide the processor in so that the tabs engage the metal cage, and then applying pressure to the processor board (remove RAM in the top slot first!) to engage the LIF connection.
Hope this saves someone a few minutes of rooting around for a torx driver.