This is why many will advise newbies to get instruction from a person and not just the written words. A mentor/teacher can help the beginner to develop good practices before the bad ones take root.

At the various shops I've worked in (and owned at one time) we talk about "book smart" home mechanics. While reading up on how to do this or that is a good starting point it lacks the details and nuances that make the difference between "workable" and "good" results.

I didn't soak out flux from my earlier frames until I learned more. But being young those frames either were crashed/retired or were moved on from so I never saw corrosion caused failures. I have cut open a few of my older frames and found rust/flux in the joints and this drove me to do a better job of cleaning out the interiors before painting. Andy (who now has a few soaking/cleaning out methods).