So disgusted with myself!

My fiancé does such a great job (I mean REALLLLLY GREAT) with oral sex and I'm Terrible at it😕.  I WANT to be good at it with him. I want to make him feel as good as he makes me feel. Please help. Give me some advice. He says I'm a little too rough....like he doesn't want an aggressive hand job. He didn't use these words, because I think he's trying to be nice and not hurt my feelings.  He's spent the past year getting what I like down pat and I want to do the same for him.