Not sure if that approach is useful. Wouldn't it be better to build something and note where you struggle the most along the way?

I currently face a similar problem, as I want to pick up playing the guitar again. How to get into deliberate practice mode? I consider just going through a book step by step. On the other hand, as my real goal is songwriting, perhaps it would be better to just start writing songs and try to learn what I need along the way (presumably by copying elements from music I like, that is, trying to figure out how to achieve certain effects).

I have also considered to just check out random guitar lesson videos on you tube. Perhaps that way I could pick up new techniques and then see what I can create by employing them.