Yeah, I’m not too advanced myself. I’ve been using Linux for several years now, but haven’t done a whole lot of rooting around, and while I know some basic programming, I don’t ever write anything too complicated - I’m certainly not a developer.
But, based on this other thread, it looks like @kakaroto has a script that you run to update coreboot.
So it should be pretty idiot-proof!
I’m not a Librem user yet either (hopefully I’ll be getting my Librem 12 soon, but I’m holding off on a Librem 15, as my current computer is too recent a purchase to justify turning around and buying another new one), so I haven’t tried running his script, but I’m pretty sure I’ve seen other forum members commenting that it worked wonderfully.