I've just used Gardners twine and some plastic clothes pegs, I was surprised to see how quickly the bud sites on the main stem that were at a right angle to the light source before I went to bed had grown to full upright again.
It really is a remarkable plant!
How long do I leave it in each position for? It's been about 36 hours, should I tie it down the other way now?

Feel free to adjust the ties on a daily basis if needed. With a little bit of practice you'll figure out how to bend branches down to keep the canopy even. Nice job so far