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Go get it done professionally. You'll regret it if you don't, and it turns out badly.

Same here, my hair is the same length and colour.. I have also been watching youtube videos but i watched the chalking ones as well.. since your hair is dark the chalk works well and i have used it in my hair. (plus its not permanent or damaging like bleach) You can buy special hair chalk at most hair styling shops or online.. All you do is ether get the one in the mini hair straightner thing and use it like you are straightening your hair, doing sections at a time then brushing each section and straightening it on top of the chalk to make it last longer.. or you can your the botte one and just brush in on your hair and then a repeat of the other step (brusing and straightening) you can get different colours and you can use more or less to get a darker or lighter effect!! Hope it helps :)