Here it is!
1. Leave it in around 20 minutes. Always stay near a mirror so you can see it develop.
2. If one side develops faster, wash off the color with a wet washcloth.
3. When it's done to your satisfaction, wash out the color.
4. Shampoo your hair twice, follow with a toner and a moisturizing mask.
Overall, I thought it was a rewarding experience. While I've done the traditional boxed color experiment during college (maybe a few times), it was nice to be more in control of the process. It was satisfying being able to put the money I would've spent into my savings account.
As with any experiment, I had a few difficulties. Probably the most frustrating was working with my own head. I couldn't see everything or sometimes reach to where I needed. I was also pretty nervous. I mean, it's my hair. I'm very protective of it. I was also terrified of it getting stringy or damaged if I left the bleach on too long. Thank you for those nightmares, Youtube tutorials.
I would recommend doing it yourself with a few tips. Always have someone around to help, even if it's just for emotional support. Always be in front of a mirror and watch the time! Research! Know what products you should use. Know how long you should leave the color/bleach on for. Watch videos, even the scary ones! If you are new to getting your hair highlighted or colored, think about having a friend or professional do it.
Otherwise, have fun! Don't be afraid to experiment! I'm thinking next time I might add a few lo-lights. DIY Balayage, Part 3? Maybe!