there are sprays on the market that will deaden your gag reflex. they work for some women, and not for others.
i'd agree with somewhat lovely; go slowly. take a little more at a time. penises are shaped/curved differently, so i can't really tell you what exact technique to use. after all, if his curves down/up/right/left, is especially thick, or whatever, it makes a difference in how it goes down your throat. your mouth structure--teeth, size of cavity, etc. is also a factor. hate to be so technical, but it's true.
breathing techniques help keep you calm and also help the air go out the nose. you kinda need that whole mouth!
have fun.