receiving oral

Okay, so I was by no means raised to be the prude I am. my mother and I had a very open relationship about our lives, but I've only given oral to two men, and received from one. I love it, but I get so nervous every time he starts to go down on me. he can tell and he is trying to walk me through it but I was wondering if y'all had any tips for how to feel more confident in myself...?