Everybody says to harvest when "___ %" of trichomes are "amber." (fill in the blank)
Trouble is that trichomes are hard to interpret.
Some of us have a lot of trouble distinguishing clear from cloudy from amber.
Better for me is to look (no magnification) at the tint of the trichome sheen on the sugar leaves: silvery sheen = clear trichomes, milky sheen = cloudy trichomes, slight gold sheen = some amber.
When the plant looks ripe, I get out my magnifying glass, look at trichomes, and still wonder what to do.