I suppose that it depends on the book. A technical manual would require constant reference, Anki decks, and time to absorb the material. Something like Nand2Tet

I suppose that it depends on the book. A technical manual would require constant reference, Anki decks, and time to absorb the material. Something like Nand2Tetris might only require working through once or twice. If you have a project based book, then you can take it a project at a time and build from there. For me, learning accounting and physics back in the day required multiple references and exposure to learn something new and to learn it well. I think the most important factors are perseverance, trusting that you can do this, breaking big problems into small ones, and having multiple sources for the same material in case it doesn't 'click' in only one source. My two cents. I hope this helps.