Yes, it will void your warranty. Yes, very few people can do it. Yes, it will cause you great anxiety while it is being done. But you can upgrade Mac with soldered RAM to something bigger for a fraction of the cost of going through Apple. So are you brave enough? Proof... Are there shops who can do this? Would be sweet to be able to cheaply upgrade... Macbook Pros to up to 128GB of RAM Macbook Airs to up to 16GB of RAM Macbooks to up to 16GB of RAM
^my friends from China always recommend that I purchase the base Apple device... then they will bring it to Schenzhen for me for the necessary upgrades...
I recall a few years back in my trip in Shenzen, there were repair shops that actually offered storage upgrades on iPhones and android phones. My friend tried the service with her old iPhone and it worked flawlessly. I heard in the area it was a common aftermarket upgrade. Although I do not recommend doing this to new M1 Macs, perhaps a few years down the line, these after market upgrades will help extend the life of these M1 Macs beyond AppleCare.