As someone who worked through Rudin in their free time as a working adult, I cannot recommend it to someone for self-study who doesn't already have a calibrated

As someone who worked through Rudin in their free time as a working adult, I cannot recommend it to someone for self-study who doesn't already have a calibrated mathematical sense. By that I mean that they are good at figuring out how to adapt a proof sketch with many omissions (more typical at higher undergrad/grad/research) into one that is more conscientious about tying up all the "trivial" technical details. In my case, I was a CS major, and I had experience with proof assistants, so it was doable with many excursions to Wikipedia, math overflow, ProofWiki, etc..