harvest is generally is 6-8 weeks depending on maturity of trichomes.

I harvest entire plant...others harvest top and leave bottom to mature. I just did this on a re-veg and it reverted back to veg state. All the lower small buds died off and looks like it did when i re-vegged then last time. I am not saying this is the rule, but it just happened to me.

the presence of trichomes means that there is potential for thc; Not a confirmation...
make hash or; I only prune the isolated fan leaves, leaving the others wrap around the bud and protect it. I grind the whole bud small leaves-buds-leaves-thrichome-thc, and all;
For a very enjoyable smoke...goodluck