First time blow Jobs

PLEASE someone give me tips on giving a good blow job?

My boyfriend is going to want to go down on me tomorrow night, and I’ve always wanted to go down on him but I REALLY need help because I know if it doesn’t feel good or if I do something wrong I’ll get turned off because I’m so embarrassed. I really need ANY advice, like where do I put my teeth? what if I don’t like the taste of skin? omg help :(