If your careful you can snip off the pollen sacks and put them in a vial or ziplock baggy and store it in the fridge. When it comes time to apply it using a Q-tip (make sure no fans are blowing around don't want them colas all seedy) and gently rub the Q-tip in the pollen then rub the pistils with it. Them in a few weeks you will have ripe seeds. Just make sure you pollinate the lower buds.