Most folks start spraying the nodes area on limbs u want....once or twice a day, start spraying a week b4 u flip to 12/12 and another week or so after that then stop..after a week or two you will see male pods forming at the nodes u sprayed and any other places if you got spray drift..   i like to keep my plants shorter in my CS projects,  it just makes it easier and less time growing  IMO...  also when the pods start making the pollen, u can shake those limbs against or over other limbs that have the white hairs on the buds and seeds will form..   you can also use Q-Tips or a artist paint brush to dust the buds hairs..  also u can use tweezers to pull off the male pods that have the lil nanners of pollen and move those around over other buds to spread pollen..  are various ways.. takes like 4 to 6 weeks after dusting to form strong viable seeds