Its not hard to flash a rom these days, unlike ten years ago.
Now developers post instructions for each device type. Look at Lineage, Graphene, DivestOS. Very good instructions from all of them, including installing ADB on Windows or Linux.
Of the dozens (hundreds?) of times I’ve flashed over the years, I’ve bricked 1 device, and that was from experimenting and not following instructions, I knew it was risky.
And with Pixel it’s about as straightforward as it gets.