…and the question ‘where can [I] find a guide,’ or very similar, has been asked since at least 2006… except, all we get is avoidance and/or ‘nice’ obfuscations…
Personally, I have come to the conclusion that PSUD(x) is useless (to myself) as it stands. And… that is a great shame on tts author? How many of us wish it were otherwise?