You can look up "The Mind Illuminated" by Yates (Culadasa) and Immergut.
It is completely devoid of run-of-the-mill pseudo-spiritual stuff, and consists of practical advice that you can follow.
It is a complete guide that provides step-by-step instructions.
Ah, perfect, that's exactly the sort of thing I was looking for, thank you!
I started reading this book some years ago but quickly gave up when after the first chapters it was made clear that you would have to put a lot of time into the practice. I don't remember what the book's recommendation was. How much time do you spend on it?