I always start out very carefully.
And then I get impatient.
After the dye is on, I wrap my head in plastic wrap and then leave the dye for like, 5 hours.
The first time I tried this tactic, I didn't do anything to keep the dye off my skin. This was an error.
I wore a lot of hats for the next week.
I'm pleased to say I've learned a lot and now I hardly ever dye my ears pink.