This is no longer as hard as it has been in the digital-deep past. You need to learn now. The time has past for taking control being an early adopters thing. Linux is orders of magnitude larger than Windows in terms of both hardware compatibility and software. All of the issues that still exist are due to shitty companies that are trying to exploit you with proprietary theft of ownership. You should self educate and know about these anyways. They are the foundations of the dystopian technogarchy. Almost anything a generation or two old is going to work fine with Linux and little research needed. You can buy stuff from specialists like System76, Star Labs, and Tuxedo. You can even buy several options with Linux preinstalled from Lenovo and stuff like the HP Dev One.

You can buy routers with OpenWRT preinstalled or even versions with simplified front ends like pcWRT and others.

Installing Graphene on a Pixel is not hard. This is nothing like the old days of custom ROMs on phones. Graphene will introduce you to a Matrix chat embedded in their webpage just in case you have any issues or do not understand something after reading the documentation. There is an enormous supportive community for Graphene on their Matrix channel and someone will help you in a live chat. The entire build process is almost entirely automated. All you do is open a chrome browser and plug in USB following the instructions once. All the updates are automatically installed over the network after that. The bootloader is locked, root is locked, it is just like a typical OEM experience except there is no stalkerware with things like google recording everything from your microphone 24/7, tracking your location, and everyone/everything you interact with.