Jorge just dont make it clear enough in the bible, the red hairs mean somthing but there just part of the story. Yer hairs are red when ready to harvest but also on a bud thats not ready. Let me tey and explain it a little better and see if it helps-
RED, WITHERED hairs that have RECEDED back into the SWOLLEN CALYX dictate that that flower is or has reached maturity, this sh!t happens all the time, now when almost all the flowers have reached matyrity then the bud is ready to harvest. Generally very few new flowers will be immature or being made at harvest time meaning that most if not all the bud is mature and ready to be cut.
Now difference may be seen where the lower buds take longer to mature than the top main colas as well. Trichromes turn from clear or white to amber or a lovely golden colour, you can tell they are like this because there are thousonds and thousonds of them, loads turn amber and this is the thc degrading to othe great substances. You will see patches of amber and gold on leaves and calyxs if you look up close, i can see each individual trich if i look up real close.
It can and is hard for the first time and new grower to gauge harvest, yer you will get it wrong at first but you will learn, check out thse pics of ripe fat bud, look at the balls, the little seed shaped calyxs, this is bud to me, anything else is just harvested too early. You want balls on your bud with withered red hairs, it swells up fat like this and then you harvest, when 70/80 percent is like this probably harvest soon or within a week or two.
Seriously remember very few new growers harvest late, they mainly harvest early and early harvested weed is crap to smoke imo, wait it out dude, Peace