Magisk is not hard to install either, especially if you’re using LineageOS (since the Lineage bootloader is readily available). Look up a guide sometime, if you managed to flash a.ROM you should have no problems with it.
Once Magisk is installed in the bootloader you just need to run the companion Magisk app for settings, and Fox’s Module Manager to find and update Magisk modules. It’s basically a sort of specialized app store that deals in Magisk modules only.
In fact you may want to have a look at Fox’s before you install Magisk, see if you find any interesting module. There’s some really cool stuff available.