Well first off a heavy fert will only add to the shock so let's not do that. Just some plain water and a smile.

I trim anything that will not make it to the screen - leaves, branches, everything. Now remember they will stretch so judge accordingly. If you don't remove this growth it will continue to develop taking resources from the buds at the screen level. It also makes for better air flow and makes it much easier to get under the screen when needed. Any branches can be used for clones if you run a veg room.

For the hobby grower scrog is great. Maximum yield for a small plot.

Good luck!