Too scared to attempt unicorn ombre.

Coloured the purple(directions hair dye) myself after the unicorn ombre faded. Would love to try and do it myself, but with the turquoise at the ends(think it looked too harsh at the roots) and starting with purple into cerise, then turquoise) but I'm too scared that I mess it up lol, and it doesn't blend well together. I also don't have patience, and my health sometimes makes it hard to keep my hands above my head for any length of time. Is there any simple ways I can try to blend in the colours?