Invest in a scope. I have this. Works well.
https://www.amazon.com/gp/aw/d/B00XNYXQHE?psc=1&ref=ppx_pop_mob_b_pd_title
Trichomes can tell you a lot. Remember tho that trichomes are always being made so you'll always have clear. You want like 80% milky/cloudy 10-15% Amber the rest clear but...