Swallowing advice?

Bekah
Okay, so for my SO's birthday, I told him I would swallow, but I'm really nervous about it, because I'm afraid something bad will happen, like I'll throw up or it will come out of my nose, or it will taste bad. I've heard many horror stories about this. Does anybody have any tips or advice? Or can share their experience with it what you think would be best? He's turning 21 and he said he wants to go crazy on his birthday, drinking wise, and I know that alcohol makes it taste disgusting. Help me please! I told him I would do it, but I'm really nervous, it's my first time swallowing.