Opening that era of Mini is not as bad as some say, with keen eyesight and good light it can be done if you follow the iFixit pictures carefully. It's the price to pay for a small form factor.
I've been fixing Macs (paid hobby) since apples became Apples in 1970 something, I hate the glued together form over function stuff they produce these days. Yesterday I opened up a friends 2008 MacBook Pro as the fans were noisy, HD and swappable battery accessible after opening a flip latch, fans accessible after removing 6 or so screws. Enough crud and food in there to make soup! But easy to do, Apple started to make it difficult around 2010 = throw it away and buy another - that MBP now does browsing, music, videos and email perfectly well again.
Many vape devices are the same now, particularly those with built in cells ofc... where's the screws? I want to get in! Oh dear, built in obsolescence, throw it away, buy another.
Waste!