Start checking your trichomes if you have a magnifier, I usually cut when 80% milky and 20% turning amber. If the trichs are right, cut, dry, cure, and enjoy!
If cut while trichs are clear or only slightly cloudy, you'll probably have headache bud that doesn't have proper potency. Too late with heavy amber color to most trichs will be a harsh smoke and kill the mood of bud that could have been much better, its somewhat of a delicate balance.