first tattoo soon, advice?

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I'm turning eighteen soon and I am so excited to get my first tattoo! I picked out my tattoo to be one that stretches my bikini line between my hipbones. (Kind of like this but smaller) 
I was wondering if anyone could tell me how bad the pain will be? (Ie, how many friends I should bring to hold me down) I've never had anything like a tattoo done before and I really want to be prepared for what's coming. Btw this is the tattoo I'm getting