Best oral tips appreciated!

I’ve never done oral because of anxiety. I’m afraid I’ll taste bad or something weird so I’ve never let a guy eat me out (I know I’m missing out). How do you make it taste good or know it does or doesn’t smell? I want to do it and have a guy I’d be comfortable with if I didn’t have this anxiety.

I’m also scared to give a blowjob (never have) because of performance anxiety. I don’t know what I’m doing. I’ve watched some porn but realistic. How do I practice or know what to do?

So best advice for receiving oral and making sure all is good down there and for giving head!