Blowjob rookie

Ok so I'm 17, boyfriend is 18, and we have only been together for a month. I have had past sexual experiences and not afraid of having sex but giving bjs is a completely different story. I am just so scared I'll be bad at it or he won't cum, this isn't a direct question, I just really want to be able to give my boyfriend a bj without getting anxiety and chickening out. HELP PLEASE XO