The meme about Linux being difficult to set up was probably definitely not about installing GNU or GNU-like distributions, but Android.
In the last decade I've install over a dozen of free operating systems on four different architectures, many times on a chroot, and bootstrapping has always been a single step. A child could do it. How do I know? I was something of a child meself.
LineageOS? Thou needst to sacrifice 2 goats, summon a devil, sell thy soul for a holy sword to kill the same fucker to make some devil wellington. Upon savoring such delicacy, thou shalt finally gain the strength to flash the image flasher.