You'll need a way to see what condition your trichomes are in. I use a 5x magnifying glass, but some need a 100x pocket microscope from Radio Shack. ($12.00 or so?)
In general:
Mostly Clear trichomes - undercooked. light heady buzz. Light body effects.
Mostly Milky trichomes - mature, and it's up to you how far you want to take 'em.
A few Rusty trichomes - The meds are as good as they are going to get. Heavy body stone and...mind clearing. Taking the ladies past this point, and you risk nanners she might throw-out in a last-ditch effort to self propogate.

Make sure you're looking at the globular head of the trichome, and not the hairs. Just like in life, hair color does not denote maturity.

I know at this point you can't make the taller ones duck, but...any way to raise the shorter plants up to the light(s)?