If you're looking for an idiom, you could say:
Pull yourself up by your own bootstraps.
And I will add from my comments a personal favorite:
Here, let me google that for you.
For the latter, it's only used as a sarcastic response when asked a question that can be easily found online.
For the bootstrap phrase, this doesn't just refer to learning though. It can refer to any personal success where one succeeded by virtue of their own determination.
Fun nerd fact, this is where we get the computer term 'bootstrapping'. See: https://english.stackexchange.com/a/35133/185028
With regard to that link, I don't agree with the part that says [achievement] "with minimal resources", but think the more general "with existing resources" part is more accurate.