advice/ tips for a BJ?!! (!!)

So I'm doing something with this guy on Friday. I've given a BJ before but it was really stressful and it didn't work out well because I was nerve wrecked and hardly knew the guy. But this time I want to do it right? I need some tips!! What to do, what not to do, how ect. 
Please help me 🙈 I just wanna make it good and not feel embarrassed about doing it so badly 

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