Get a jewler's loupe or magnifying glass of any sort that's 30-60x. Can be as cheap as $5-7 or you can get some fancy ones that take really nice pictures too.
Read ed rosenthals run-down on trichomes. Amber is when things are breaking down, but you likely want some portion to be amber.
One thing i would note is that after you cut a limb off, it is still alive for maybe a day or two.. possibly more on some low level that may not be relevant to this. Large limbs would live longer than cutting off individual buds to dry.
My point is that trichomes continue to develop after you chop it from the plant. I'd observe the plants too as they dry. If you use clones or a similar strain or see somethign so common you can plan for it, you may find you cut the plant a day or two earlier and it will reach the development you actually intended to have.
If you have too much light or heat, it may never seem to finish, if only looking at top canopy - as it throws new pisitls, foxtails and evaporates trichomes from heat and/or light. So, judge it all over, and it may alert you to a small problem you didn't know you had, too.