[Q] First Time Rooting

My G3 is running on lollipop and I'd like to root it using Towelroot, (never done anything like this before) do I have to return it to kit kat first though, not sure how to do that either lol, the real reason I'd like to root it is because I've got the quick circle case and I've seen some brilliant watch faces on xba forums that I'd like to use, my phone is a D855 and V20H version.

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