First grow improvisation RS11

if you use a trellis for only support, you still have time.. figure about half way up the future vertical growth is good for support. If used to help train the plant horizontally, put it on now or even before this point in future grows. Defoliation is not wise. Selectively pruning is fine. Always have a reason to remove a leaf. They do several important things for the plant - light absorption, molecule production/building, and they are the lungs. So, if you dont want to reduce the limiting factor of CO2 intake, don't blindly remove a bunch of leaves thinking it helps.... There''s a chance you delay flower due to the stress of it, too. Read "to defoliate or not..." on cocoforcannabis.com. the guides and posts in dr photons corner will help you avoid numerous urban myths/bro-science nonsense.

If you do a defoliation do it before the flip. I would suggest also give the plant a couple days to recover before flipping. Yes you can add netting now if you like. If i was to add a net i would do it one week after the flip.

leave as much as u can till after stretch, If stuffs in the way of you doing stuff you can get rid of a few, i usually do around d21, net before flip, you can always add another if/when needed

Nah, should be ok. ensure it has room to strech up and keep the light in a good position as not to stunt growth.

Also, youre going to be watering and feeding pretty much everyday in flower with that pot size. Fabric pots tend to dry out quicker than solid ones. I suggest you pot her up one more time, give her at least a week to root and then flip!