How to realistically give a good bj?

I was with my high school boyfriend from 17-24, and he was only the 2nd guy I was ever with, and I’m really shy and anxious so I don’t typically give head, my rule is only in a relationship which I’ve successfully avoided for a good 3 years, but now I’m in one and we are 8 months in and asking for it. I haven’t given head in so long and I’m so nervous that I will be horrible. I am looking for realistic tips not porn tips, on how to start and actually do it? I’m most nervous about starting, do I just pop it in my mouth? Lick it? Lick the top?
How to realistically give a good bj?
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