Advice on how and when to start trimming fan leave...

Small defoliate right before or at flowering....wait another couple weeks and do another small defoliation. Aim for less is more....you can always take away some but you can't add it back. Oh and defoliate very close to harvest too just to get those big things outta the way and don't have to deal with it when you're trying to chop the plant down

I do tge swazzing method and it works really great defoiliate at beginning of flower then again three weeks into flowering check out my journal of royal domina they both were defoiliated

2 great answers above 👌, plus I found GrowWeedEasy to be a great site. Here's a tutorial on defoliation: https://www.growweedeasy.com/nebulas-flowering-stage-defoliation-tutorial

The first plucking can be done after the 3d week of flower, once the stretch has finished. After that there are 2 ways: do a second major defoliation 3 weeks later or light defoliation every few days.

Hi there Al, after the flower stretch you can pick out the fan leaves lower down that have turned dark green or are blocking light to flower nodes. Once the leaves lower down have turned dark green they've done their work and you can remove them. check out a technique called lollipopping too - works great . Doing this will let the plant focus it's energy on making flowers and hopefully will increase yield. Hope this helps ! 🚀