I just tryed it out on the runt of the litter to get some practice in its about a foot tall in its second week of flower is that to late to start. Will it cause more harm than good at this stage
Gently tying down stalks doesn't cause any harm unless a mistake is made, such as bending one too far. It's never too late to move the stalks around if you wish to do so.
To my surprise it was flexible didn't snap or break I'm going to post a pic so you van see what I did