It is tough for everybody. It's one of those pernicious things that sounds simple until you try it and start to realise just how many assumptions about the relationship between things are baked into both your mental model, as well as tooling.

A lot of things in UI are like this, but given the way the web has developed, it's particularly true. The article goes over some of this, although I think it kind of assumes the reader is more or less familiar with some of the issues that come up, but it could probably still give a naive reader some idea.