Hey Hazy, wonderfull looking plants. I'm really curious how you will LST your girls because they have already developed such nice thick stems. I'm in the same situation right now because my girls are 18 days old and I wanted to start to LST them yesterday, but the stems are so thick already that there was no chance to bend them gently without causing any damage
I hope this helps to answer your question.
The thing to do, is not to try to bend the maturing central stem but to push the plant over by gently applying pressure below the cotyledons. This way you start angling the plant without the risk of breaking them, as the material at the bottom of the plant is different, then just tie the stem off to an anchor point. See pic below.
This picture shows at what point the plant has been tied off.
The other thing is to make sure that you send the forming side branches at each node to either side of the cane, depending on which side of the plant they are on, not always clear, one to the left one to the right. this is important as we want to try to keep the branch spreading even, allowing for more room later for when the side branches are tied to the outside canes.
Here is the second plant, again it has been gently pushed over as opposed to trying to bent the maturing central stem.
I hope that helps you to decide how to proceed with LSTing at this stage of growth, without fear of breaking your plants.