Awesome guide. It looked daunting but I did it with my 9yo son and it was actually really easy. There were a couple of steps where you needed small fingers for sure. My old HDD (1TB 5400 RPM) tested with Black Magic showed Read/Write speeds of 30-30 MB/s. With a Crucial 1TB SSD hooked up via USB (in a cheap little enclosure) it was 41 MB/s. Same SSD installed inside the Mac Mini: 350-390 MB/s read and 420-480 MB/s write. And it absolutely flies compared to the stock drive. I ended up ordering the parts from Amazon because iFixIt was out of the T9. Wish I could contribute some money to iFixit or Sam, because this was an incredibly valuable guide. (Let me know if/how I can!)

Pro tip: I used one of those pill boxes with compartments for every day of the week, to store the screws from each step. That way I'd make sure to use the correct screws when reassembling.

Do you really need TR torx drivers or will regular non-tamper-resistant ones work?