Salt and Vaseline is often used, depends on the style of scarring you want. That technique leads to keloid scarring, which is often raised and pigmented, which is good, but also uneven, which in a complex piece like my arm can ruin the entire design.
Rubbing in the peroxide is truly a horrid experience, done that one before. This time I'm going with wetting some paper towel with white vinegar, sitting it over the whole thing and waiting 5-10 minutes, hopefully it lowers the pH enough that quick healing is inhibited.