I thought that I could go gray in a day, no matter how much I read on blogs and videos where they said that dark brunette hair was the hardest shade to go gray.
I worked with a colorist. She was fantastic. I had about five inches grown out, so she put foils all over my hair and bleached it and toned it, and 10 hours later, I walked out of there.
Some of my best friends, not so much. Some friends my age and older were horrified and just knew I would cave in and dye it! But my younger friends were HUGE supporters.