I'm not sure exactly how this works, but you can get CBD as pills with no THC in them.

(Although anecdotally the best results are obtained from taking mostly CBD with a tiny bit of THC; it appears that the latter does something that makes the former's effect more potent. So you see stuff like e.g. 20:1 CBD:THC pills around - can't get high on that, but very effective at pain management. However pure CBD pills are still more common.)

Yes but the trick is mostly just harvesting early.

Yes