Watch out, these mixing instructions are for mixing 3 liters from the larger dev kit (which makes 8 times 3 liters), while the kit you use makes only 2 liters of working solution. Plan accordingly when you mix, or your developer will be too dilute this time.
Right! I derive percentages from the amounts given in the instructions and use those to figure out how much of each component I need to make however much I need to make. I'll make sure to be extra careful this time, though…just so I know it'll turn out as well as possible.