And if you’re not blond, you’ll need to be.
I was very resistant to this at first, despite hearing it from multiple stylists. It seemed like such an extreme step! But think about it: if you took a marker and drew on a white piece of paper, the color would show much truer than if you were drawing on a darker piece of paper. It’s the same idea here.
So I eventually relented. Chemically speaking, this step was the most challenging. I had all that red dye built up in my hair, and it wasn’t going to become blond in one pass. There was a lot of strawberry-blond in-between-ness that went down over these seven months. (At James’s suggestion, I used a brightening shampoo formulated for blond and silver hair to help expedite the process.)
Even if you’re not starting with red hair, you might have the same issue if your hair isn’t currently a lighter tone. The cooler the blond, the better, and lots of hair colors can’t get there right away. The other crux of this issue is that you can’t lighten your hair too frequently—you’d damage the living daylights out of it. We had to stagger my highlight appointments every eight weeks or so, which is part of why it took so long to get pink hair.

Above: me about halfway through the process. As you can see, there was still a lot of red in my hair.
If you absolutely don’t want to go blond, you’re not without options.
Yes, I had to commit to balayage to get my hair to a brighter shade of pink. But if you just want something really subtle, you can forgo highlights. Before going blond, I had my hair colored with a demi-permanent mix of red and magenta that made a lovely raspberry-toned mélange of red and pink hair. It washed out pretty quickly, but it was fun while it lasted. Ask your stylist about trying this with a tone that works with your current color. (Blues, greens, and purples can create a pretty cool tint on darker hair, for instance.)
Whatever route you choose, pink hair going to be fairly high-maintenance.
These “unicorn” tones just don’t last the way traditional hair colors do. So whether you go blond first or not, you’ll have to see your colorist pretty frequently if you want to maintain the look. (Which also means you can try new cute hair colors each time if you get bored.) If you do go blond first, the good news is that highlights have a lot of staying power. Once you get the blond you need, you’ll only have to refresh this base every three to four months. And remember: those color-depositing shampoos and conditioners are your friends. Use them often—they definitely help.
With that said, I’m happy I went pink. YOLO. (Unless of course you’re an actual unicorn, in which case I’d like to think you get to live forever.)