Trust me, there IS a science to it!
Get all of your ingredients out and ready. Follow the box instructions on this but if using multiple boxes of dye, get every bottle of dye ready for use.
Start at the top of the head and work forward, then backward, concentrating on making sure to drench the whole dreadlock in dye.
Follow timing and rinsing instructions on dye box.
DO NOT Condition your dreadlocks as the dye instructions direct. You can now twist your dreadlocks as usual because the gel used to twist dreadlocks acts as a conditioner for your hair and overconditioning will soften dreadlocks.