blowjob tips

My bf wants me to suck his dick but I just get so nervous. We’ve been dating for 2 years already and have had sex but sucking dick makes me so nervous bc I fear that he’d think it was really bad or something and I just don’t like the attention (like of me doing something if that makes sense LMAO) I know everyone has to start somewhere but I need some tips on how to give a BJ 😭