You spend weeks preparing your killer festival attire: after all, there are accessories to consider, not to mention outfits for every imaginable weather scenario, as well as footwear, bags, and makeup to plan. 

Then there's hair: very much the crowning glory of your fun and fabulous summer getup. In short, no matter how painfully-cool or bang-on trend your apparel is, your tresses still need to be tantalising.

And with everyone from Lily Allen to Rita Ora, and Katy Perry to Paloma Faith sporting bright and colourful strands, in particular rainbow-hair is going to be the key festival look of 2015.

But if you're unsure as to how to create Coachella-worthy styles, thankfully Great Lengths has done the hard-work for you.

Just follow the easy-peasy steps below, and make sure to watch the video at the end too: