No. You have to know none of that. You just have to copy/paste the steps from the rails-homepage (where they should be prominently listed, the lack thereof is the real bug).

"hey, download this all-inclusive, up-to-date, guaranteed to work disk image straight from us!"

Wait, how is that different from above?

Yes, you may be done 2 minutes faster. But you just deprived yourself of at least getting a glimpse on which parts are involved, even if you don't understand them yet. That means you're now even more hopeless when stuff breaks later (and stuff always breaks later).

And as a fun fact: Any sane bootstrapper would use the exact same script behind the scenes anyway. There simply is no other way unless you plan to re-invent homebrew and rbenv along the way.

I'm really troubled to understand who we're trying to care for here. It sounds like you want to make this Really Easy for absolute beginners who can barely setup a printer.

That is a noble goal (for a printer driver), but if you want to teach someone programming then there's a point where you have to stop dumbing it down artificially. And that point is as early as possible.

The worst you can do to a newbie is to put him into an opaque sandbox with different behaviors and errors from what the "big guys" are using.