What is the opinion of Reddit about the
Walidake Universal Switch Opener for Mechanical Keyboard, New Mini MX Switches Open Tool Accessories for Keycap Keyboard Switch Gamer to Customize DIY MOD Switches?

You can buy the switch openers on Amazon. This is the one that I have and it works perfectly fine. I prefer plastic/3d printed ones over metal as my friends have told me the metal ones have damaged/bent their switches. Also, if you don’t want to purchase an actual switch opener for some reason there are alternative ways of opening them like using a small flathead screwdriver. Videos on YouTube often show different methods like this if you don’t have an actual switch opener. But I can tell you that having an actual switch opener will speed up the process by a lot as you will have to do this to 80-90 switches.

And yes, my GMMK TKL keyboard is my first keyboard build! I’ve learned a lot from customizing everything to my liking.