Read over the instructions on your dye kit before you begin. Note the processing time on the directions, since you'll need to rinse out when time is up to avoid overprocessing the hair.
Mix your dye with developer in a non-reactive -- a.k.a. non-metal -- bowl or in a squeeze bottle. Put latex gloves on to protect hands from the chemicals.
Apply dye to your strands using the applicator brush or the squeeze bottle. Saturate your tresses. Set the timer when you finish.
Rinse out the dye until the water runs clear once time is up. Shampoo your hair with a product for color-treated hair, then rinse out. Condition with moisturizing conditioner, and allow the conditioner to penetrate for several minutes before rinsing out.
Wait at least one month before you go lighter. Once a week, give your blonde mane a deep conditioning treatment to deposit plenty of moisture into the hair. Monitor the hair's condition. If hair feels brittle and dry or breaks off, your hair is damaged. If it feels soft and looks shiny, you're good to go lighter.
Repeat the dye process from start to finish using one shade lighter than the blonde you're rocking at present. After this color change, wait another month to six weeks. Again, nurture the hair to keep it healthy.
Work your way lighter like this until you find the right shade of blonde for you. Going gradually keeps the look from appearing dramatic.