How to upgrade the SSD hard drive in a Dell XPS 13 (9360)

June 6, 2018 Update: I've also posted a video of the SSD replacement process, embedded below:

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I recently purchased a used Dell XPS 13 (model 9360), and I chose to purchase the base option (with 128 GB SSD) since it was cheaper to do that and upgrade the SSD to a larger model (500 GB) aftermarket than to buy a higher model XPS (I bought this model: WD Blue 3D NAND 500GB PC SSD).