AsNoriuanswered grow question 4 years ago I start it ussually when plant have at least 5 nods, then i bend her heavily first time.
Later you tuck leaves and bring side branches to light, when those mature - tie them aswell.
You can check my First and last auto diary or 8 sisters, there is plenty pictures, video and explanations .
Good luck !
P.s. lst girl before watering, less broken branches.