It's not a matter of strapping on big boy shorts. I don't have a cam, lights or a microphone.
Righto.
Then strap on some peripherals?
Doing a picture-in-picture type setup with your reaction to and analysis of the original video should get you past the fair-use benchmark and all you'd need to worry about is not titling the upload something objectionable to YouTube's algorithm.
I don't have a lighting setup specifically for doing videos. I have thought and am still thinking about getting something along those lines but from what I can tell that's not strictly necessary for non-professional purposes. Between the overhead light and a desk lamp aimed at a wall (adds brightness without hard shadows) I can't complain about the results... I'll leave that to my haters. lulz
That just leaves a camera and a microphone neither of which these days have to be terribly expensive to get good results.
The recording/streaming software is free if you use something like OBSStudio which I can't recommend highly enough. The editing software is also free if you use a kit like fxhome's HitFilmExpress although there I do recommend upgrading to a Creator subscription (a few bucks a month) for access to some useful effects, filters, etc.
Just do it for fuck's sake.
If I can literally anyone can. Seriously.