so you want others to do all the work and tell you when? then who do you blame when it doesn't work out as you want? LOL
you have to learn. experiement with different levels of ripeness. Perventage of amber trichomes is strongly correlated. 10%? 50%? 100%? People have a wide range of preferences. You'll have to figure yours out on your own as we all do/have.
You probably want an earlier window harvest, but assuming things just makes people look like asses.