I will add a reference to what @Budz offered. Can’t give a direct link so check
growweedeasy DOT com SCROG tutorial
This is my first use of a two net scrog. I do not however use a net primarily for training purposes. I use it to help manage and maintain a consistent canopy height. And, in a two net setup to provide support for the buds. I am hoping I will need the second net and it is not just wishful thinking.
It is a Nugbuckets Mainline and vegged for 77 days.
This was a faster growing main so I bent it over using the net. In other situations I simply tie it to the frame or the net depending on the direction I want it to go
I do most of the work and training well before the net goes up - couple of weeks earlier