BJ MENTAL BLOCK

HELP!! So I’m with this guy and we have been “talking” for about a month now. He’s going to make us official in the next couple of days. He tried to finger me the first time we hung out, and I told him I didn’t want to do anything with anyone that I’m not actually dating, and he was very respectful and said ok. We are going to a party together and I want to give him a blow job, but I never have before and I’m nervous! He’s not pressuring me at all, but I know he wants that eventually. I’m ready and I want to do it, but I’m just nervous about it. Any tips on how to make it good for both of us and how to make sure I do a good job?