need advice / help :/

i’ve been with my boyfriend for just over a month now and it’s fair to say we are pretty sexually active. he is AMAZING when it comes to pleasing me , and i really want to repay him , he’s not asked for anything but i want to. problem is i’ve never given a blow job in my life and i wouldn’t even know where to start ! i don’t want to disappoint him so i’m nervous incase i do , i got drunk once and told him that i’d never given a blow job and honestly have no clue on how he feels about it. please can i have some tips and advice ? ( feel like i could be over thinking but it’s what i do best ) x