i wana dye the underside of my hair myself... how should i do it?

Answer 1

Take all of your hair that's on top and tie it in a tight bun. Then, work in sections. Divide your bottom hair in 2 sections, and work on one, and then when you're done dying that side, leave it out of the way and do the other side. Keep your top hair in the bun until you are finished dying it and when it has dried.

Answer 2

aluminium foil