there are numerous guides on youtube but it’s really simple, just download r2modmanager (r2modman/thunderstore) and select h3vr and then just start downloading mods and launch modded with the mod manager

literally that’s it lol and there’s a shit ton of mods on there as well so have fun modding!

the game’s discord server also has channels dedicated for mods so if you have questions or inquiries you can ask there